Nothing in cosmetic dentistry is permanent. Whitening fades over one to three years. Bonding lasts several years and is repairable. Veneers and crowns last considerably longer but still have a working life, and the tooth underneath can still decay.
Treating these as maintainable rather than finished is the difference between a result that ages well and one that has to be rescued.
Whitening
Typically one to three years before a noticeable relapse, though it varies enormously with diet and smoking.
What shortens it: coffee, tea, red wine, dark sauces, tobacco. What extends it: rinsing with water after staining drinks, professional cleaning at routine intervals, and occasional top-ups. If you had custom trays made, a top-up is quick and inexpensive — which is a practical reason to choose supervised whitening over a shop-bought kit. See professional versus at-home whitening.
Composite bonding
Commonly several years on a front edge, longer where the bite is favourable and the habits are good.
What ends it: chipping at the biting edge, gradual staining at the margins, and wear. What helps: not biting into hard things with bonded edges, a night guard if you grind, avoiding abrasive and charcoal toothpastes, and having it polished at check-ups — which restores much of the original lustre and is often all that is needed.
The advantage is that bonding is repairable. A chip is added to and repolished rather than the whole restoration being remade. See composite bonding.
Porcelain veneers
Considerably longer than bonding, and often a decade or more when well made, well cemented and well looked after.
What ends them: debonding, chipping or fracture under heavy load, and — most commonly — decay at the margin where the veneer meets the tooth. That last one is worth emphasising, because it is the one patients do not expect. The veneer itself does not decay; the tooth behind and below it can, and the margin is exactly where plaque collects.
Grinding is the largest single threat. If you clench or grind, a night guard is part of the treatment. See dental veneers.
Crowns
Often a decade or more, and frequently much longer.
What ends them: decay at the margin, fracture of the porcelain, loss of the underlying tooth, or a problem with the nerve of the tooth beneath requiring root canal treatment through the crown. Again, the crown outlasts the situation more often than it wears out. See crowns and bridges.
What determines the outcome more than the material
Your bite
If the restoration takes a heavy contact, or takes a load during sideways jaw movement, it will fail early whatever it is made of. Checking and adjusting the bite is part of the treatment.
Grinding and clenching
The most destructive habit for cosmetic dentistry, and the most commonly unaddressed. A night guard protects everything discussed above, and wearing it is the single highest-value maintenance habit — see teeth grinding and jaw clenching.
Cleaning at the margin
Nearly every long-term failure starts at the junction between restoration and tooth. Brushing that line properly and cleaning between the teeth daily is what prevents it.
Gum health
Gum recession exposes margins that were designed to be hidden, which is both an aesthetic and a decay problem. Stable gums keep the result looking as intended — see gum and periodontal care.
Acid
Erosion from fizzy drinks, citrus or reflux undermines the tooth around restorations and accelerates wear on natural enamel, which changes how the two look together.
Planning for the long run
If you are in your twenties and considering veneers on eight front teeth, the realistic expectation is that they will be replaced at least once and possibly twice in your lifetime, and that each replacement removes a little more tooth. That is not an argument against having them. It is an argument for choosing the least invasive option that achieves what you want, and for taking the reversible route first where one exists — see veneers versus composite bonding.
What the maintenance actually involves
Longevity figures assume the restoration is looked after. What that means in practice is fairly specific, and it is rarely spelled out at the point of treatment.
Cleaning the margin, deliberately. The junction between restoration and tooth is where nearly every long-term failure begins. Angle the brush at that line, and clean between the teeth daily — a crown or veneer does not protect the surfaces either side of it.
Polishing at check-ups. Composite recovers much of its original lustre with polishing, and this is the single cheapest thing that extends its life. Ask for it rather than waiting to be offered it.
Wearing the night guard. If you grind, this protects everything you have had done. It is also the instruction most often abandoned within a few months.
Avoiding abrasive products. Charcoal and heavily abrasive whitening pastes dull composite and scratch the glaze on ceramic, which makes both more plaque-retentive and more prone to staining.
Periodic radiographs. Decay under a crown or at a veneer margin is invisible from the outside and painless until it is advanced.
The warning signs of a restoration beginning to fail
Acting on these early usually means a repair rather than a replacement:
- A dark line appearing at the margin, particularly on composite.
- Sensitivity in a tooth that has a crown or veneer, especially to cold or to biting.
- A rough edge you can feel with your tongue or floss that catches.
- Food packing into a space that was not there before.
- Gum inflammation localised to one restored tooth.
- Any movement, however slight, in a crown or veneer.
- A chip, even a small one.
Planning for replacement before you need it
Anyone having extensive cosmetic work in their twenties or thirties should expect at least one replacement cycle in their lifetime, and each cycle typically removes a little more tooth. That is not an argument against treatment — it is an argument for three things.
Choose the least invasive option that achieves what you want. Take the reversible route first where one exists. And keep a record of what was done, in what material and in what shade, so a future clinician is not guessing — particularly if the work was done somewhere you no longer attend.
Frequently asked questions
Is there a guarantee?
Clinics offer various arrangements on remakes within a period. No one can guarantee a restoration in a living mouth subject to biting forces, and a promise that sounds like one deserves scrutiny.
Do veneers fall off?
Debonding happens occasionally and can often be rebonded if the veneer is intact. Repeated debonding usually means something about the bite needs addressing.
Can old veneers be replaced?
Yes. The existing veneers are removed and new ones made, usually with a little more tooth reduction.
Do I still need check-ups with veneers or crowns?
More than before, arguably. The margins need monitoring and the underlying teeth need checking radiographically.
Protect what you have had done
If you have cosmetic work and have not had it reviewed in a year, that is the most useful thing you can do for its lifespan. See our cosmetic dentistry page.
To arrange a consultation at our clinic on Abbas El-Akkad in Nasr City, call +20 101 969 7597 or message us on WhatsApp.
