3 myths surrounding veneers, debunked

Media item: article on dental veneers

Date published: 13 June 2023

Subject: common misconceptions about dental veneers

This page records the media item. The original article text is the property of its publisher and is not reproduced here. What follows is an independent, evidence-based account of the same subject.

What a veneer is

A veneer is a thin facing bonded to the front of a tooth to change its colour, shape, alignment or surface. Two materials dominate:

• Porcelain veneers — made in a laboratory or milled from a ceramic block, then bonded to a prepared tooth.
• Composite veneers (composite bonding) — tooth-coloured resin shaped directly onto the tooth in a single appointment.

They are cosmetic treatment. They do not treat disease, and they are not a substitute for treating decay or gum disease first.

The myths worth examining

Myth: "Veneers are reversible"

Mostly false, and this is the most important thing to understand.

Most porcelain veneers require the enamel on the front of the tooth to be reduced — typically around half a millimetre, sometimes more. Enamel does not grow back. Once it is removed, that tooth needs a veneer or a crown for the rest of its life. If a veneer chips or debonds in twenty years, the option is a new veneer, not going back to the original tooth.

There is a genuine exception: minimal-preparation or no-preparation veneers, which are practical in a narrower set of cases — small teeth, teeth already set back, worn edges. They are not suitable where teeth need to be made to look straighter or where the existing teeth are already prominent, because adding porcelain without removing enamel makes teeth bulkier.

Ask specifically: how much enamel will be removed from each tooth, and is a no-preparation approach possible in my case?

Composite bonding is genuinely reversible in most cases, needing little or no tooth removal. For a younger patient it is usually the right first step, because it defers the irreversible decision.

Myth: "Veneers are permanent"

False. Veneers chip, debond, stain at the margins and eventually need replacing. Commonly cited service lives fall in the range of ten to fifteen years for porcelain, with wide individual variation; composite is shorter and needs polishing and repair along the way.

What actually determines how long they last:

• Grinding and clenching. Untreated bruxism breaks porcelain. A night guard is usually part of the plan, and skipping it is a common cause of early failure.
• Gum health. A veneer margin sitting on inflamed or receding gum looks wrong regardless of how well the porcelain is made — and recession over time exposes the join.
• Bite forces and habits. Biting nails, opening packaging with your teeth, chewing ice.
• Decay at the margin. The commonest reason a veneer fails is biological, not mechanical.

When one fails, the whole veneer is remade, not repaired. Over a lifetime that is a recurring cost, and it belongs in the decision.

Myth: "Veneers will fix crooked teeth"

Only in a limited sense, and often at a price that is not disclosed.

Veneers change the appearance of alignment by altering the visible surface. They do not move teeth. To make a noticeably rotated or protruding tooth look straight, the practitioner must remove more enamel from the prominent parts — sometimes a great deal — and in significant cases that means removing enough to require a crown, or devitalising the tooth so that it needs root canal treatment.

Orthodontics moves the tooth instead, and removes no enamel at all. It takes longer — typically 18 to 30 months for comprehensive treatment, less for minor alignment — and it requires lifelong retention. But it does not commit the tooth to a lifetime of restorations.

A well-considered plan for someone unhappy with crooked front teeth usually looks at orthodontics first, then whitening, then the smallest cosmetic addition needed — often composite bonding rather than veneers. A plan that goes straight to eight or ten veneers, without discussing alignment, deserves a second opinion.

The sequence that avoids expensive mistakes

1. Treat disease first. Decay, gum disease and any acid-erosion source. Cosmetic work placed on an unstable foundation fails.
2. Manage grinding. If you clench or grind, that is addressed before ceramic goes in, not after it breaks.
3. Consider orthodontics if alignment is the real complaint.
4. Whiten before, never after. Porcelain and composite do not lighten. The natural teeth must be at their final shade before the restorations are matched to them, or you will be replacing the restorations to change the colour.
5. Trial it. A diagnostic wax-up, a digital preview, and ideally a temporary mock-up worn in the mouth before anything irreversible happens. A screen rendering is a proposal, not a prediction.
6. Get it in writing — the number of teeth, the material, the preparation involved, the total cost, what maintenance is required, and what happens if one fails within a year.

On advertising and images

Australian law restricts how cosmetic dental treatment may be advertised. Advertising a regulated health service must not use testimonials about clinical care, must not create an unreasonable expectation of benefit, and must not be misleading including by omission.

Before-and-after images are permitted but conditioned: they must be realistic and comparable — same view, same lighting, no filters or digital alteration — must state that individual results vary, and should state when the after image was taken. A photograph taken two weeks after treatment shows a result at its best and says nothing about how it looks at ten years.

Common questions

Is ‘ten to fifteen years' actually the answer to how long veneers last?

Treat it as a figure in circulation rather than a published standard. No dental authority publishes a veneer lifespan in years, and the reason is that a lifespan is the wrong shape of answer — what the research reports is the proportion of veneers still in service at a stated time point, which is a different and more honest quantity.

What the published survival data says, with its denominators attached:

• A meta-analysis of porcelain laminate veneers found a 10-year cumulative survival of 95.5 per cent across roughly 3,300 veneers, counting fracture, debonding, secondary caries and the need for root canal treatment as failure.
• The longest-running cohort in that literature, Beier and colleagues, followed 318 veneers in 84 patients from 1987 to 2009 and reported Kaplan–Meier survival of 94.4 per cent at 5 years, 93.5 per cent at 10 years and 82.93 per cent at 20 years.
• Beyond twenty years the evidence simply runs out; the reviewers state that an estimation of longevity past that point is lacking.

Two cautions before you use those numbers. Survival is not the same as still looking right — a veneer counted as surviving may have been repolished, repaired, or may have visible margin staining or gum recession at the join. And these are averages across studies with different patients, materials and operators; the four factors listed above are what move an individual case, and untreated grinding moves it hardest.

Porcelain or composite — what does the evidence actually show?

A genuine trade-off, and the numbers point in opposite directions to the convenience.

On durability, ceramic wins clearly. A head-to-head analysis by Mazzetti and colleagues in 2022 reported annual failure rates on survival analysis of 3.9 per cent at 5 years and 4.1 per cent at 10 years for composite, against 1.4 per cent and 1.2 per cent for ceramic — a hazard ratio for failure of 4.00 (95% CI 2.74 to 5.83). On the stricter ‘success' measure, which counts any repair or intervention as a failure, the gap widens further. A separate 2023 review pooling randomised trials of resin composite veneers found survival of 88 per cent (95% CI 81 to 94 per cent) at a mean follow-up of 24 to 97 months, with the commonest problems being surface roughness, colour mismatch and marginal discolouration.

On everything else, composite has the advantages the page above describes: little or no enamel removed, so the decision stays reversible; done in one appointment; repairable in the mouth rather than remade; and lower cost each time. Those are not small.

The practical reading is that the question is not which material is better but which failure mode you would rather have. Composite fails more often and is fixed cheaply and repeatedly. Ceramic fails less often and, when it does, is replaced. If you are young, undecided, or the change you want is modest, the reversible option keeps every door open.

If a veneer only covers the front, why would anyone have a crown instead?

Because sometimes there is not enough tooth left to bond a facing to — but the difference in what is removed is much larger than most people are told, and it is worth seeing the numbers.

Edelhoff and Sorensen measured how much coronal tooth structure different preparations remove: about 63 to 72 per cent for a crown, against about 16.7 per cent for a traditional facial veneer. Read that with its limits attached — those measurements were made on anterior teeth, in vitro, on a typodont, not on molars and not in a patient's mouth. The proportions do not transfer to a back tooth.

What they do establish is the scale of the choice. A crown is roughly four times the tooth removal of a veneer on a front tooth, and the more tooth removed, the closer the preparation comes to the pulp and the higher the chance that tooth eventually needs root canal treatment. So a crown is the right answer where a tooth is already heavily filled, cracked or root-treated, and the wrong answer where a veneer would do. If a crown is proposed for an intact front tooth on cosmetic grounds, that is a question worth asking directly, and a reasonable point at which to seek a second opinion.

I have been quoted a fraction of the price overseas. What is the actual catch?

The Australian Dental Association's policy on elective overseas dental treatment is unambiguous, and it is a professional position rather than an evidence base — worth saying plainly, because no Australian dataset quantifying complication rates after overseas veneers appears to exist. Its summary is that such treatment ‘carries the risk of adverse oral and general health outcomes with long term problems which may be difficult to resolve on return to Australia', and that ‘Australian residents should only seek elective dental care in Australia'.

The specific risks the policy names are the practical ones rather than the dramatic ones:

• Consent and standards. Treatment may be delivered ‘without full informed consent and at a different professional and regulatory standard'.
• Repair cost. Work ‘may also require extensive and costly repair procedures on return to Australia', which is the arithmetic that undoes the saving.
• Records. ‘The records and complete details of treatment obtained overseas are unlikely to be available' to whoever treats you next — so the next dentist may not know what was removed, what material was used or what was cemented.
• Cover. Complications from elective treatment abroad ‘are not always covered by travel insurance and the treatments may not be covered by Australian health funds'.
• Time. ‘Optimal ongoing oral health cannot be achieved in a single episode or short course of treatment and requires regular maintenance' — which is difficult to arrange from another hemisphere.

There is also a finding from the published literature that patients rarely anticipate: some private providers have described actively avoiding the provision of remedial care for people who had dentistry abroad, because of concern about liability. Getting the work done is the easy part; getting someone to take responsibility for it afterwards is not. Turkey Teeth: the real risks of getting veneers overseas covers what that looks like in practice.

Related reading

• What is the difference between porcelain crowns and veneers?
• What is the difference between composite veneers and porcelain veneers?
• The case for same-day porcelain veneers versus temporary veneers worn for 2–3 weeks, and the same-day porcelain veneers service page
• Turkey Teeth: the real risks of getting veneers overseas
• How can I improve my smile with porcelain veneers and crowns?
• What are my options if I want to change the shape of my teeth?
• I want a smile makeover. Where should I start?
• The mock-up reveal: why you should see your new smile before any treatment begins
• Dr Maliha Siddiqui, General Dentist and Dr Peter Henderson, General Dentist
• More coverage in Our Media

Practical details

Smile Solutions, Level 1, 220 Collins Street, Manchester Unity Building, Melbourne VIC 3000. Phone 13 13 96, or theteam@smilesolutions.com.au. Monday–Friday 8.00am–6.00pm, Saturday 8.30am–1.30pm, Sunday by appointment.

Every practitioner's registration can be verified free on the AHPRA public register at ahpra.gov.au.

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