When a set of veneers starts to look different after many years, the porcelain is rarely what has changed. Porcelain holds its colour and shape well. What moves on is everything around it: the gum line, the thin seam of bonding cement at the edge, and the natural teeth either side, which keep ageing and staining while the veneers stay much the same.
That is why most changes in older veneers are a reason for a review rather than a sign of failure. Some need nothing more than a polish, some are solved by treating the neighbouring teeth, and a smaller number mean a veneer needs to be replaced.
Well-made porcelain veneers often last a long time
The long-term research on porcelain veneers is reassuring. A 2016 systematic review and meta-analysis in the International Journal of Prosthodontics (Morimoto and colleagues) pooled 13 clinical studies and estimated overall survival at 89 per cent over a median follow-up of nine years. Chipping or fracture was the most common problem, at about 4 per cent, while severe staining at the margins and new decay were each uncommon.
A study by Layton and Walton, published in the same journal in 2012, followed feldspathic porcelain veneers bonded mainly to enamel for up to 21 years. Estimated survival was 96 per cent at ten years and 91 per cent at twenty years across all the veneers studied. Those results came from a single prosthodontist using careful technique on suitable teeth, so they show what is possible rather than what every veneer will achieve.
Composite veneers, made from tooth-coloured resin built up directly on the tooth, are a different material. They are more prone to surface staining, wear and loss of shine, so they generally need polishing and repairs more often and tend to be replaced sooner than porcelain.
A dark line at the gum is often the cement, not decay
The veneer is held on with a resin cement, and the fine line where veneer meets tooth is more likely to pick up colour than glazed porcelain. Over years of coffee, tea, red wine or smoking, that seam can darken into a thin brown or grey line. On composite veneers the whole surface, not just the edge, can take up stain.
A stained margin is usually cosmetic, but it should still be checked. Decay can start at the edge of any restoration, and on an X-ray or under magnification a dentist can tell a stained seam from a soft, decaying one.
Gum recession changes where the edge sits
When veneers are first fitted, the edge is often placed at or just under the gum line, so the join is hard to see. If the gums gradually recede, a band of natural tooth or the cement line can become visible above the veneer. Thin gums can also let a darker tooth or edge show through as a greyish tinge.
Recession has its own causes, such as brushing too hard, gum disease, grinding or simply thin gum tissue, and those deserve attention in their own right. Where recession has left gaps between teeth near the gum, our article on black triangles between teeth explains the options, and in more advanced cases a dentist may talk with you about whether a gum graft could help protect the root.
Your natural teeth keep changing colour
Porcelain resists staining, but the uncovered teeth beside it do not. Over a decade or more, they can darken or yellow a little with age and diet, while the veneers stay close to their original shade. The result is a mismatch that was not there at the start, even though the veneers themselves have not changed.
Sometimes the simplest fix is to whiten the natural teeth back towards the veneer shade, rather than replacing the veneers. Whitening does not lighten porcelain or composite, so this only works in one direction, and it needs an assessment first.
Signs worth booking a review for
- a new dark or grey line along the gum edge
- a veneer that now looks lighter or darker than the teeth beside it
- a chip, rough patch or sharp edge you can feel with your tongue
- bleeding, tenderness or recession around one veneer more than the others
- a veneer that feels loose or moves when you bite
A loose veneer in particular should be seen soon, because a gap under a partly debonded veneer can trap plaque against the tooth.
Polish, treat the neighbours, repair or replace
The right response depends on what the review finds. A dull or lightly stained surface can often be polished. Small chips in composite can usually be repaired by adding new material. A shade mismatch caused by darker natural teeth may be improved with whitening. Replacement is mostly kept for veneers that are cracked, broken, loose, sitting on decay, or where recession has exposed the edge so much that it can no longer be disguised.
If the review finds a cracked or heavily restored tooth under an old veneer, a different restoration may be more suitable, and our guide to inlays, onlays, crowns and fillings explains how those choices are made. Whatever is proposed, you should receive a written treatment plan with fees first, and our guide to informed financial consent explains what it should include.
Questions about older veneers
Do veneers have to be replaced every ten years?
No. There is no fixed replacement date. Many porcelain veneers stay in good condition for well over ten years, and the decision is based on how the veneer, tooth and gums look at review.
Can a tooth decay under a veneer?
The porcelain cannot decay, but the natural tooth at the edges can, especially if plaque collects along an exposed or poorly sealed margin. Regular check-ups and careful cleaning along the gum line help.
Why has one veneer worn more than the others?
Uneven bite forces, grinding or clenching on one side, or a habit such as nail biting can concentrate wear on one tooth. A review may include a check of your bite and whether a night guard would help.
Having your veneers checked
If your veneers have been in for some years and you have noticed any of these changes, a review is a sensible first step before deciding anything. At Lumi Dental we offer a free cosmetic consult where we look at the veneer edges, gum health and shade, take clinical photographs if useful, and talk through whether a polish, whitening of the surrounding teeth, a repair or replacement makes sense.
