Why does my dentist want to replace all my fillings?
Short answer: Sometimes it is justified — old fillings do fail, and decay underneath is real. But a plan to replace every filling at once, particularly ones that are not causing symptoms and are intact on x-ray, deserves questioning. An old filling is not automatically a failing filling. Ask which specific ones have a problem, and what that problem is.
When it is legitimate
- Decay underneath. Visible on an x-ray as a dark shadow beneath the filling. This is the strongest reason and it is real.
- The seal has broken down. A visible gap or stained margin lets bacteria in.
- The filling or tooth is cracked — especially with pain on biting.
- The filling is fractured or a piece has gone.
- Recurrent sensitivity localised to that tooth.
Fillings are not permanent. Replacement over a lifetime is normal and expected.
When it deserves questioning
Two situations are worth pausing over.
"Amalgam fillings should come out because they contain mercury." Major dental and health authorities do not recommend removing intact, functioning amalgam fillings on health grounds. Removing sound amalgam actually releases more mercury vapour than leaving it, and each replacement removes more tooth. If you want them changed for appearance, that is a legitimate personal choice — but it is a cosmetic decision, and it should be presented as one.
"They're old, so they all need doing." Age alone is not a diagnosis. A twenty-year-old filling that is sealed, intact and symptom-free is a filling that has done its job well.
Each replacement removes a little more tooth. Over a lifetime, unnecessary replacement is how a small filling becomes a large one, then a crown, then a root canal. Dentists call this the restorative cycle, and it is a genuine reason for restraint.
What to ask
- Which specific teeth, and what is wrong with each?
- Can you show me? On the x-ray or an intra-oral camera image. A real problem can usually be pointed at.
- What happens if we monitor instead? Watching a questionable filling for six months is often perfectly safe.
- Can we prioritise? Do the ones that need it, keep the rest under review.
- Is this for decay, or for appearance? Both are valid. Knowing which changes the decision.
A good dentist will welcome these questions and answer them with evidence on a screen. We show findings on screen for exactly this reason — you should be able to see what we are seeing.
Get another view
A whole-mouth filling replacement plan is a significant amount of money and a significant amount of irreversible drilling. That is precisely the situation second opinions exist for.
Bring the plan and any x-rays. Free, any dentist's plan, and we are entirely comfortable saying "these three, yes — the rest can wait." See also crown or filling?
Common questions
Do old fillings need to be replaced?
Not because of age alone. A filling that is sealed, intact and causing no symptoms is working. Replacement is indicated for decay underneath, a broken seal, a crack, or fracture.
Should I have my amalgam fillings removed because of mercury?
Major dental and health authorities do not recommend removing intact, functioning amalgam fillings on health grounds. Removing sound amalgam releases more mercury vapour than leaving it. Replacing them for appearance is a legitimate personal choice, but it is a cosmetic decision.
Is replacing all my fillings at once normal?
It is uncommon for all of them to genuinely need it at the same time. Ask which specific teeth have a problem and what that problem is, and ask to be shown it on an x-ray or camera image.
What is the restorative cycle?
Each time a filling is replaced, a little more tooth is removed. Over a lifetime of unnecessary replacements a small filling becomes a large one, then a crown, then a root canal. It is a genuine reason for restraint.