What happens if decay starts under an old veneer?
Small marginal lesions can be repaired in place; decay spreading beneath usually means removal first.
A veneer shields only the front face of a tooth, so decay usually begins at the margins or on the uncovered surfaces and works inward. Because the ceramic hides the early stage from view, radiographs at routine visits are how these lesions are caught small.
Repair in place or remove and restart
A small lesion right at the margin can often be excavated and sealed with composite while the veneer stays on. When decay has undermined the ceramic, the veneer comes off, the tooth is treated, and the dentist rebuilds with a new veneer or, if too much structure is gone, a crown.
Cavity risk varies between individuals with saliva, diet, and hygiene, so prevention is tailored: fluoride toothpaste, floss at the margins, and recall radiographs on the schedule your dentist sets. Sensitivity or a soft-feeling margin between visits deserves an early appointment rather than a wait.
MediIndex articles are for general information only and are not medical advice, diagnosis, or advertising. Outcomes vary by individual — consult a board-certified specialist for personal decisions.