What Published Studies Report About How Long Crowns and Veneers Last

What survival figures do published studies report for porcelain veneers?

Three peer-reviewed systematic reviews report survival figures for laminate veneers, and the three do not measure the same object. Klein P, Spitznagel FA, Zembic A and colleagues, in the Journal of Esthetic and Restorative Dentistry in 2025 (PMID 39523553, DOI 10.1111/jerd.13351), give the pooled result: "Meta-analysis revealed a pooled survival-rate of 96.13% for feldspathic, 93.70% for LRGC and 96.81% for LDS at 10.4 years." Under the sourcing order our methodology page sets out, a pooled figure of that kind describes the restorations counted inside the included studies. It is not a measurement of teeth treated in any particular country, and nothing in it is a statement about work done in Turkey.

What the pooled figure covers is stated by the Klein review in its objectives: "To analyze survival and complication rates for anterior and premolar laminate-veneers out of different ceramic materials (feldspathic, leucite-reinforced glass-ceramic [LRGC], lithium-disilicate [LDS] and zirconia)." The review reports its own base — "Twenty-nine studies were included." — and dates its evidence: "The date of last search was on February 19, 2024." Two things follow from reading the objective beside the result. The material names are not decoration, because feldspathic, LRGC and LDS are different ceramics and the review reports them separately rather than as one number. And the teeth counted are anterior and premolar, so the figure says nothing about a veneer placed on a molar (PMID 39523553).

A second review compares two ways of preparing the tooth. Hameed FF, Rajendran MR, Kalaiselvam R, Rajakumaran A, Ramesh SR and Kuzhanchinathan M, in the Journal of Contemporary Dental Practice in 2025 (PMID 42607000, DOI 10.5005/jp-journals-10024-3981), report: "Reported survival rates ranged from 91 to 100% overall, with no-prep veneers demonstrating a slightly higher mean survival (97%) compared to conventional veneers (92%)." The base under that sentence is narrow and the review states it: "These studies, published between 2016 and 2022, involved 126 patients and 612 veneers, with follow-up periods ranging from 2 to 9 years." The review identified 375 articles and included four of them (PMID 42607000), which is a small foundation for a range as wide as 91 to 100%.

Which complications each preparation type produced is reported separately by Hameed and colleagues, who write: "The predominant complications in no-prep veneers were marginal chipping and debonding, whereas conventional veneers showed higher incidences of fractures and catastrophic failures." They state how the included trials were appraised — "Risk of bias was analyzed using the Joanna Briggs Criteria (JBI), which indicated a low risk of bias across the included studies." — and then bound their own claim in its opening words: "Within the limitations of this review, no-prep veneers exhibited superior survival outcomes and fewer complications than conventional veneers while preserving enamel and minimizing postoperative sensitivity." A low risk of bias across four trials does not make four trials into many (PMID 42607000).

Resin composite laminate veneers are a different material and are counted separately. Lim TW, Tan SK, Li KY and Burrow MF, writing in the Journal of Evidence-Based Dental Practice in 2023 (PMID 38035903, DOI 10.1016/j.jebdp.2023.101911), report: "The overall pooled survival rate of the randomized controlled trials was 88% (95% CI: 81%-94%), with the mean follow-up time ranging from 24 to 97 months." Averaging that number together with the ceramic figures reported for feldspathic, leucite-reinforced and lithium-disilicate veneers would merge two materials into one estimate, which is why it stays in its own sentence with its material named. The same review words its own comparison in relative terms: "the direct laminate veneer group demonstrated higher survival rates than the indirect approach".

Zirconia laminate veneers are the one material here with a hole in the evidence, and the hole is declared by the meta-analysis itself rather than inferred by us. Klein and colleagues report the short-term result — "Zirconia showed a 100% survival-rate with no complications at 2.6 years." — and then write the limit in their own words: "No long-term data was available for zirconia." The conclusions repeat it: "More studies providing long-term data on zirconia laminate-veneers are needed." A survival figure measured at 2.6 years (PMID 39523553) cannot be read as a lifespan, and the people saying so are the authors of the pooled estimate.

Whether one ceramic outlasts another is answered by the Klein meta-analysis with one flat result and one qualified one. On the comparison between materials it states: "No difference was found between materials." On the long view it states: "Feldspathic, LRGC and LDS laminate-veneers showed high survival-rates at long-term observation." It then separates surviving from being trouble-free: "LDS slightly outperforms feldspathic and LRGC laminate-veneers with lower long-term complication rates." A material can therefore survive as often as another while needing more attention along the way, and that is a distinction the single word survival hides (PMID 39523553).

Independence between these three reviews was measured rather than assumed. Each author line was read from PubMed's own summary record and compared with the others: no author on the Klein review appears on the Hameed review or on the Lim review, and the three sets of authors sit at different institutions. Europe PMC was then asked for each record's reference list, to see whether one review cites another; it returned 68 references for the Klein record and 40 for the Lim record, neither list containing the other papers, and returned no reference list at all for the 2025 Hameed record (PMID 42607000). That last result is a gap in the check rather than a pass, and it is recorded here as one. Reading author lines is also why the crown figures are kept in a section of their own: one author on the Klein review, Zembic A, appears on an older crown paper as well, so the two literatures are reported separately instead of being counted as agreeing with each other.

What survival figures do published studies report for zirconia crowns?

Five-year survival rates for tooth-supported single crowns were pooled in 2026 by Pjetursson BE, Pitta J, Balet A, Bjarnadottir GR, Sailer I and Romandini P in the International Journal of Prosthodontics (PMID 41489982, DOI 10.11607/ijp.9633): "Five-year survival rates were: 98.5% for monolithic lithium-disilicate reinforced glass-ceramic, 97.3% for veneered densely-sintered zirconia, 97.1% for metal-ceramic, 96.8% for monolithic densely-sintered zirconia, 95.7% for veneered leucite/lithium-disilicate reinforced glass-ceramic, 94.5% for densely-sintered alumina, 94.3% for glass-infiltrated alumina, 90.4% for feldspathic/silica-based ceramic." Every number in that list is a five-year number. Under the wording ceiling our methodology page sets out, a five-year result may not be published as a lifespan, and none of the studies behind it recorded whether the teeth counted were treated in Turkey.

The horizon is stated twice in the Pjetursson review, in its title and again in its purpose: "To evaluate five-year survival rates of metal-ceramic, veneered all-ceramic, and monolithic all-ceramic tooth-supported single crowns (SCs) and assess biological and technical complications." Its base is large by the standards of this literature — "Sixty-four studies met inclusion, reporting on 3,509 metal-ceramic and 8,051 all-ceramic SCs." — and its object is crowns supported by teeth rather than by implants. A reader asking how long a crown lasts is usually asking about a decade or more. The most recent pooled estimate we could find stops at five years, and stopping there is a property of the evidence rather than a choice of wording (PMID 41489982).

Which materials sat significantly below the best performer is reported by the Pjetursson review with the test values attached: "Survival rates of feldspathic/silica-based ceramic (P<0.0001), glass-infiltrated alumina (P=0.019), densely sintered alumina (P=0.002), and veneered leucite/lithium-disilicate reinforced glass-ceramic (P=0.021) were significantly lower than monolithic lithium-disilicate SCs." Where the crown sat in the mouth mattered less than what it was made of: "Except for feldspathic/silica-based ceramic and metal-ceramic crowns, material/design types performed similarly in anterior and posterior regions." A patient told only that crowns generally last well has been handed the average of a spread the review itself declines to flatten (PMID 41489982).

A separately authored review reports a range instead of a point estimate. Leitão CIMB, Fernandes GVO, Azevedo LPP, Araújo FM, Donato H and Correia ARM, in the Journal of Prosthodontic Research in 2022 (PMID 34615842), write: "All studies showed a moderate level of quality, with a consequent moderate possibility of associated bias, using the Newcastle-Ottawa Scale (NOS), with survival rate (SR) ranging between 91% to 100%." The restorations counted are monolithic CAD/CAM zirconia crowns supported by teeth, and the review's own conclusion is written as a possibility rather than a recommendation: "monolithic zirconia might be considered as a possible option for restoring single crowns, especially in the posterior zone".

How long the crowns in the Leitão review were watched changes how its range should be read, and the authors state it plainly: "From nine articles included, there was a total of 594 participants and 1657 single-tooth restorations with a mean exposure time of 1.07 years, and follow-up period between 0.3 and 2.1 years." They also report the spread between studies: "There was high heterogeneity between studies (I2 = 93.74% and Q = 79.672)." A band of 91% to 100% (PMID 34615842) measured at a mean exposure of just over one year is a short-term observation. Quoting it without the exposure time beside it would turn a one-year window into an answer about durability.

Two further findings from the Leitão review describe what happened rather than what survived. On the gums around the crowns it reports: "Bleeding on probing (BOP) were reported with an average value of 29.12%." On what went wrong it reports: "Failures and/or fractures, mostly total and requiring replacement, were observed in three studies." A restoration that fails totally and has to be replaced is exactly the event a reader asking about lifespan has in mind, and the review records it in three of the nine articles it included (PMID 34615842).

Two survival papers can look like two sources and be one. Five of the crown and complication records held on this question — PMID 41489982, PMID 25842099, PMID 34642991, PMID 30328190 and PMID 23062125 — all carry Pjetursson BE on the author line, and four of the five carry Sailer I as well. Those author lines were read from PubMed's summary records rather than recognised from the titles, which is the only way the overlap becomes visible: the journals differ, the years run from 2012 (PMID 23062125) to 2026 (PMID 41489982), and the titles read as independent work. Counted as one source, they leave the second foot of this section to be found elsewhere, and the review by Leitão and colleagues is where it was found.

What the two crown reviews agree on is narrower than it first appears. Both count restorations that were still in the mouth at the end of the period observed, not restorations that were unchanged, and neither reports how many were replaced afterwards. The 2026 review (PMID 41489982) sets zirconia beside the older material rather than above it: "Lithium-disilicate and zirconia-based all-ceramic SCs achieve five-year survival rates comparable to metal-ceramic crowns." It adds one finding about design: "Monolithic designs reduce fracture and chipping risk, improving long-term clinical outcomes." Neither of the two reviews records the country where the work was done, so neither can be read as a figure for teeth treated in Turkey.

What do those studies say the figures depend on?

Enamel is the variable the veneer literature puts first. Alghazzawi TF, in a narrative review in the Journal of Functional Biomaterials in 2024 (PMID 38786642, DOI 10.3390/jfb15050131), writes: "The amount of preserved enamel layer plays a paramount role in the survival and success rates of veneers, and glass-ceramic veneers with minimal/no preparation showed the highest survival rates." A narrative review is not a meta-analysis, and under the evidence labels our methodology page sets out that difference caps how strongly the sentence may be worded. What the sentence describes is how much of the tooth is left standing, not where the teeth were treated or by whom.

One author screened the articles for the Alghazzawi review, in January 2024 (PMID 38786642), across PubMed/Medline, Scopus, Google Scholar and Science Direct, and the paper calls itself a narrative literature review in its own title. Its headline statement is correspondingly general: "dental veneers generally have a high survival rate (>90% for more than 10 years)". Set beside a meta-analysis that pools twenty-nine studies, that is a different kind of claim — one reader's summary of a field rather than a pooled estimate with a confidence interval around it. Both are peer-reviewed, and treating the two as interchangeable evidence would be the error.

Which failures the Alghazzawi review counts, and in what order, is reported as a sequence: "Fracture was the primary failure mechanism associated with decreased survival rate, followed by debonding and color change." It attaches one behavioural condition to the first of them — "Fractures increased in the presence of parafunctional activities." — and rules out a variable readers often ask about: "No difference was observed between the maxillary and mandibular teeth." Colour change appearing on a failure list matters for how this question is usually asked, because a veneer that has discoloured has not failed in the survival sense while having failed for the person looking at it (PMID 38786642).

Bruxism has been quantified, but in a different kind of prosthesis, and the scope has to travel with the number. Vidal RA, Martins VC, Figueiredo EZ, Roithmann CC, Bertuzzi D and Grossi ML, in the Journal of Prosthodontics in 2025 (PMID 41102936, DOI 10.1111/jopr.70046), report: "The presence of unspecific mechanical failures was associated with the presence of bruxism, which increased the overall risk (odds ratio = OR) 6.10 times." The review states its own object in the same abstract: "This review aimed to assess the prevalence and association between bruxism and different types of mechanical complications in implant-supported prosthesis, which is missing in the literature." An implant-supported prosthesis is not a crown cemented onto a prepared tooth.

How large the association is depends on which complication is counted, and the Vidal review lists them one by one: "In the specific mechanical complications, the following subgroup analysis results were found, also showing an increased risk with bruxism: (a) implant fracture (OR = 16.14), (b) prosthesis (acrylic and/or teeth) failure (OR = 3.66), (c) ceramic fracture (OR = 4.36), (d) prosthetic abutment fracture (OR = 13.88), (e) prosthetic screw fracture (OR = 7.07), (f) prosthetic screw loosening (OR = 3.40), and (g) prosthesis mobility (OR = 4.51)." Every subgroup there was measured in implant-supported prostheses (PMID 41102936), so none of them is a number for a crown cemented onto a prepared tooth.

A separate signal for bruxism sits inside the zirconia crown review by Leitão and colleagues, and it comes from a single included study rather than from a pooled estimate: "Marginal integrity showed high success rate values for the observation periods, except for one that included patients with bruxism which obtained a SR of 31.60%." One study is not a rate, and the review does not present it as one. What the two literatures support together is narrower than either on its own: grinding appears as a risk marker in both, and is measured properly in neither for tooth-supported crowns and veneers (PMID 34615842).

None of the reviews named in this article — those by Klein, Hameed, Lim, Pjetursson, Leitão, Alghazzawi, Vidal and their colleagues — records the country in which the treatment took place, the number of units placed in a single course, or how the cases were selected. The studies that report the survival figures are not the studies that report what those figures depend on, and the two sets have different authors, different designs and different scopes. Any sentence joining them into a single explanation of durability would be ours rather than theirs, and it is not published here. What the literature supports is a list of named variables, each carrying the study type that produced it.

What do published sources say about replacement?

The NHS says in one sentence, on its own page about what NHS dental treatment costs, that this happens: "Crowns may need to be replaced in the future." That page — last reviewed on 13 March 2025, with the next review due on 13 March 2028 — sets no interval, names no expected lifespan and attaches no guarantee to a crown. It is a charge schedule for NHS treatment in England rather than a statement about privately funded teeth, in Turkey or anywhere else. What it does record is where a crown sits in the NHS charge structure, and what happens when further treatment is needed soon after a course of treatment finishes.

Where a crown sits in the NHS charge structure is stated on the NHS page about what NHS dental treatment costs. It opens with "Dental treatments are grouped into 3 bands, and each band has a different cost.", prints the three headings as "Band 1: £27.90", "Band 2: £76.60" and "Band 3: £332.10", and lists inside the third band "a type of cap that covers your real tooth (crown)" alongside "a fixed replacement for a missing tooth or teeth (bridge)". A band charge is what a patient pays for a course of NHS treatment in England. It is not the price of a crown, and it is not comparable with a private quotation given anywhere.

Two months is the only numbered period the NHS charges page attaches to further work, and it is a charging rule rather than a guarantee. The page states it in two sentences: "If you have dental treatment but need further treatment within 2 months, you do not have to pay extra if the further treatment is included in the same band, or a lower band." and "You’ll have to pay for any further treatment after 2 months has passed." Read together they describe when a second course carries no second charge inside NHS dentistry in England. Neither sentence says how long a crown lasts, and neither reaches work paid for privately in Turkey.

A crown that comes off rather than fails is handled elsewhere on the NHS charges page, inside the urgent treatment list. Under the heading "Urgent dental treatment: £27.90" the page sets out what an urgent appointment can include, and one item on that list is "refixing inlays, crowns and bridges". That is a charge band for refixing rather than a statement that refixing will hold, and the page adds what may follow: "You may need further dental treatment after your urgent appointment, which may have additional costs." Refixing and replacing are two different events, and the NHS charge structure treats them as two.

What the NHS charges page puts in writing about repair is short and specific. Under the heading "Dental treatments available for free" it lists three situations, and the third reads: "your false teeth (dentures) need to be repaired – but if they cannot be repaired you'll have to pay for new ones". Dentures are named there; crowns are not. The page then points readers to the NHS Business Services Authority for replacement dental appliances rather than answering the question itself. Reading the absence of crowns from that short list as a deliberate exclusion would be our inference rather than the NHS's sentence, so it is marked as ours.

One inconsistency inside the NHS charges page is worth recording, because it affects anybody quoting a figure from it. The band headings read "Band 1: £27.90" and "Band 2: £76.60", while a paragraph further down the same page still reads: "Scaling is usually included in Band 1 (£27.40), but extensive treatment, or treatment for complex gum problems may be charged as a Band 2 (£75.30) treatment." Both readings were taken from the page as fetched on 20 August 2026, which carries the line "Page last reviewed: 13 March 2025". The band headings are published here as the figures, and the older pair is recorded rather than quietly dropped, which is what our corrections page requires.

NHS charges apply to NHS dental treatment in England and are set by regulations rather than by individual practices. A course of treatment paid for privately, whether in the United Kingdom or in Turkey, sits outside that structure: no band applies to it, the two-month charging rule does not reach it, and the NHS charges page makes no statement about what a private provider abroad should do when a crown needs replacing. Where that question is answered at all in published United Kingdom material, it is answered by NHS England's policy on self-funded treatment and by the NHS Business Services Authority's guidance to dentists.

What does NHS England's policy say about care after a complication?

NHS England answers this in a clinical policy published on 4 November 2024, carrying the NHS publication reference PRN00784, and the sentence in it that bears on replacement reads: "Please note that self-funded care that the NHS would not routinely fund would not usually be offered or replaced once stabilisation has been achieved." The policy covers treatment paid for by the patient "within and outside of the UK", so it reaches crowns and veneers fitted in Turkey without naming any country. What it offers after a complication is stabilisation, and what it declines is routine replacement of work the health service would not have funded in the first place.

What a patient can access is set out in the executive summary of NHS England's clinical policy: "Patients who have previously paid for dental treatment privately in the UK or abroad but later require NHS treatment due to a complication or sudden oral health issue are entitled to access NHS dental care for assessment and evaluation to stabilise their condition." Two verbs carry that sentence, assessment and evaluation, and its object is stabilisation. The policy states the eligibility rule separately and without qualification: "Where a patient has received their care previously does not impact on their eligibility for NHS care in the future." Eligibility for care and entitlement to have finished work redone are separate questions.

Beyond stabilisation NHS England's policy hands the decision to existing criteria rather than to the fact of travel: "Any treatment beyond stabilisation will be assessed based on complexity and need and should be provided at the appropriate care setting, subject to existing NHS acceptance criteria as laid out in The National Health Service (General Dental Services Contracts) Regulations 2005." For elective work it says the same thing in different words: "Should the patient request/require further reparative or reconstructive elective care, the provision of care and choice of care setting would be subject to NHS acceptance criteria with reference to the complexity of need." Neither sentence promises replacement and neither refuses it.

For less complex work NHS England's policy states the obligation in terms of the NHS Constitution rather than in terms of where the patient was treated: "NHS services must meet the necessary clinical needs of the patient as stated in the NHS Constitution", and "both mandatory and additional services are available to provide the treatment necessary to meet the patient’s necessary clinical need in line with general dental services contract". The operative words there are necessary clinical need. A crown replaced because it has failed clinically and a crown replaced because its owner dislikes the shade are not the same request under that wording, and the policy leaves room for only one of them.

Who is expected to deal with a problem first is stated before the NHS route is described: "It is expected that patients would initially seek support from their self-funded dental care provider, who should be responsible for any post-treatment clinical issues within a reasonable timeframe." The policy text as fetched was scanned for a number followed by a unit of time, and it contains none; "within a reasonable timeframe" is its only expression of duration, and that phrase is unnumbered. So the document naming the original provider as responsible does not say for how long, and a patient reading it cannot derive a period from it (NHS England, PRN00784).

The route a patient actually travels is drawn as a flow chart at the end of NHS England's policy, and it opens with a triage rather than with a judgement about the treatment already received: a patient arriving at a general dental practice or community dental service with an oral health issue related to self-funded work is triaged by the dental officer there. The first question is whether the patient fits NHS acceptance criteria; the second, once pain and infection have been dealt with, is whether there are additional needs. A patient with none reaches the end of the process at that point, with the acute problem treated and nothing replaced (NHS England, PRN00784).

Where a patient may go is listed rather than restricted by NHS England's policy: "Patients may present directly to primary or secondary dental or medical care settings, or via 111 urgent assessment and referral." The policy then describes a sequence — assessment, an acute management plan, and "Pain and infection are addressed" — before any question of further work arises. For the most extensive treatments it names the category explicitly, including "advanced multi-unit fixed appliances and/or implants", and subjects them to trust-based policies, NHS acceptance criteria, treatment-specific guidelines and NICE guidelines. A patient whose crowns all need replacing falls in that last category, where the answer is a criteria test rather than a yes.

What did the NHSBSA say about repair and replacement entitlements?

NHS Business Services Authority published a knowledge base article numbered KA-02010 whose title is the question a dentist asks — "What can I provide a patient on the NHS who has just recently returned after having dental treatment abroad?" — and its answer on entitlements is one sentence: "If the original treatment was not provided by the current contract provider, 'Further treatment within 2 months', 'Free repair / replacement' and 'Regulation 11' replacement appliance will not apply." Three named entitlements are switched off there. The article does not name Turkey, or any other country, anywhere in the page text that was accessed, and none of the three is switched off for being foreign.

The first of the three entitlements named in KA-02010 is the two-month rule, which the NHS charges page describes from the patient's side: a further course inside two months, in the same band or a lower one, carries no second charge. The NHS Business Services Authority article KA-02010 states the condition that removes it, namely that the original treatment was not provided by the current contract provider. A course completed in another country meets that condition in exactly the way a course completed at a different English practice does. What operates is the change of provider, and the article says so in its own words rather than ours.

A free repair or replacement, and a Regulation 11 replacement appliance, are NHS entitlements attached to work carried out under an NHS contract, and what KA-02010 does is say when they do not attach. It does not say that a returning patient may be turned away: the same article states the opposite baseline in its opening sentence — "Dealing with a patient who has been treated abroad is no different to seeing a patient who has previously received care under another contract in England or Wales." Being treated and being entitled to a free repair are two different things, and the article keeps them apart.

None of the three entitlements is defined in the NHS Business Services Authority article KA-02010 that switches them off. It names them and stops there, so a reader has to go elsewhere for what each one covers, and the NHS charges page points in that direction rather than answering it: under its own further information heading it links the NHS Business Services Authority page on "Replacement dental appliances (such as dentures, bridges and braces)". Dentures, bridges and braces are the appliances named there. A crown is not among them, and no page in this set states a replacement entitlement for one.

What must still be provided is stated with its own conditions attached: "If the patient is accepted in England and the treatment is not Unscheduled Care or if it’s not an Urgent Care Package in Wales, any treatment appropriate to Mandatory Services identified as clinically necessary must be provided subject to the patient or their representative’s consent." Three conditions sit inside that sentence — acceptance, the type of care, and clinical necessity — and consent closes it. The obligation attaches to what is clinically necessary rather than to what a patient would like replaced, which is the boundary NHS England's policy draws in different language.

Two documents answer two different questions here, and treating either as the whole answer is the mistake this section exists to prevent. KA-02010 answers a charging and entitlement question put by a dentist working under an NHS contract. NHS England's clinical policy answers what NHS care a patient may access after a complication. Neither says how long a crown lasts, neither mentions the country in which the original work was done, and neither promises that finished work will be redone. That reading is ours, drawn from the two documents' own stated scopes rather than from a sentence in either.

One thing the NHS Business Services Authority article does not carry is a date: KA-02010 showed no publication date and no review date in the page text accessed on 5 August 2026, so a reader cannot tell how current it is, and the access date is recorded here instead of a currency being invented for it. It carries no figure for how long any restoration lasts either, which is consistent with what it is: guidance to dentists about charging and entitlement under an NHS contract, not clinical evidence about crowns or veneers. Quoting it as a durability source would be quoting the wrong document.

How is this question searched in the UK?

Search volume for the phrase how long do turkey teeth last in the United Kingdom was read by Semrush at three points, and it rose at each of them: 70, then 720, then 880 monthly searches. Under the measurement rules our methodology page sets out, a reading like that is a tool's estimate of query counts and nothing more; it counts neither patients, nor restorations, nor failures. The figures come from our own United Kingdom keyword dataset, held as en-olcum.json and sorular-madencilik.json, and both files record the same current value of 880 with a keyword difficulty score of 14.

A second string asking the same question is read differently by Semrush. The phrase how long does turkey teeth last, one letter apart from the first, is recorded at 0, then 170, then 210 monthly searches, with a difficulty score of 5 rather than 14, inside the same dataset. Two strings of one question therefore carry different numbers, and quoting either alone would understate the demand behind it. Our own search map records the duration bucket for this question, taking the main phrase together with its variants, at 1,260 searches a month, and under the rules our methodology page sets out that bucket rather than the single string is the honest size of the question.

Where this question sits inside the wider term is recorded in our own search map. The parent phrase turkey teeth is read at 22,200 monthly searches by Semrush, the whole question mass around that term is put at 7,830 searches a month, and the duration bucket accounts for 1,260 of them — roughly a sixth of everything being asked about the subject. So this is not a marginal question inside the term, and it was among the last of them the site was able to source. Those figures are held under the measurement rules our methodology page sets out, with the tool named and the reading dated.

Two of the other keyword corpora held here do not contain this phrase at all, and that absence was checked rather than assumed. The Moz Keyword Explorer harvest for the parent term turkey teeth returns a twelve-row question list, and no row in it asks about duration; the rows include how to cook turkey tenderloin in oven and do turkey have teeth, which is the string ambiguity this term carries wherever it is measured. The English keyword universe file we hold contains how long does hollywood smile take but not this phrase. One tool read this question; two of our other corpora do not contain it.

How far apart the tools sit on the parent term is measurable and large. Moz Keyword Explorer reports turkey teeth at a volume of 340, inside a stated range of 201 to 500, while the Semrush reading held for the same term is 22,200 — a factor of about sixty-five. Under the tool-limit rule our methodology page sets out, that gap is published rather than resolved: our own harvest note states that the two cannot be calibrated against each other, and what is taken from Moz is the question enumeration and the SERP features, not the volume. The page en/keyword-tools-disagree sets out why neither reading is picked over the other.

What a search volume can and cannot support is worth stating beside it. The tool labels the intent of this query as informational, which classifies the query and not the person typing it. A rising count means the question is being asked more often; it does not mean more restorations are failing, and no keyword dataset can separate curiosity before treatment from worry after it. No clinical claim on this page is derived from a search number, and under our editorial standards page none may be.

Why had this page not been written before now?

Our own search map recorded this question as unwritable, and the reason it gave was not that no study existed. The entry for the duration bucket — the phrase how long do turkey teeth last together with its variants — was marked as a clinical judgement that would become citable if a named cohort study were found, and beside it the map recorded that no such search had been carried out. Under the rules our methodology page sets out, an unsearched question is logged as unsearched rather than published as an absence of evidence. Those are two different claims, and only one of them was true here.

What changed was a search, not a rule. A targeted query of the peer-reviewed literature returned the systematic reviews quoted on this page, and each quoted sentence was then checked against the abstract text returned by the source database rather than against anyone's summary of it. Author lines were read the same way, from the database's own summary records, because a citation can be correct in its journal, its year, its volume and its sentence while carrying an author who was never on the paper. That failure is invisible to a sentence check, so it is given a check of its own.

The first test applied to a second source is not whether it agrees but who wrote it. Five survival papers on crowns can share an author and read as five confirmations of one another; reading the author lines is what turns that back into one source. The order used here is author line first, then institution, then citation between the papers, then a common ancestor such as a guideline both papers rest on. Only a source that survives all four counts as a second foot, and a source that fails the first test is not rescued by the other three.

Passing the author-line test is not the same as answering the question, so a source that survives it meets a second filter with three parts: whether it actually answers what the section asks, whether its independence is real rather than apparent, and whether its scope matches the claim being made. The bruxism meta-analysis quoted on this page passes the first two and fails the third for tooth-supported crowns, which is why its scope travels with its number in every sentence that carries it. A source can be excellent and still be the wrong source for the sentence it is being asked to hold up.

What still has no answer is the country-specific version of the question. None of the reviews quoted on this page reports outcomes by the country in which treatment was carried out, so there is no published survival figure for crowns or veneers fitted in Turkey, and this page does not supply one. The gap in long-term zirconia laminate veneer data is stated by the meta-analysis itself rather than asserted by us. Both are absences that can be shown, and neither is filled by writing a confident sentence in place of a missing study.

Nothing here ranks a clinic, recommends a dentist or offers a route to book treatment, in Turkey or anywhere else, and that follows from our editorial standards page rather than from a preference about tone. We are not a clinic, an agency or a booking service. Where a figure on this page turns out to be wrong, the change is logged on our corrections page instead of being edited away. One limit belongs in the open, and it is measured rather than rhetorical. A named medical editor has been appointed, and the written, dated sign-off behind that name covers this page along with the rest of the site. The condition this page did not meet has since been met: its blocks are classified in our passage table — the table that carries the evidence class of each passage, and from which a page's own class is derived — and fourteen of them are readings of ours rather than quotations, which our build will not publish without a page-by-page clinician review line recorded against them. That line is recorded: the medical editor read this page; a dated signature record was written against it and bound by a hash to those fourteen passages. The date sits in that record and not on the page.