"How long will this last?" is one of the most reasonable questions a patient asks and one of the hardest to answer honestly. The averages that get quoted describe populations, not your tooth. What is more useful is knowing what actually ends a restoration — and why a restoration that is simply old is not a reason to replace it.
Fillings, crowns, bridges and veneers are repairs, not replacements for a healthy tooth. Repairs wear, and the mouth is a difficult place to keep anything: wet, warm, acidic by turns, and loaded several hundred times a day. The honest answer to how long yours will last is that it depends on things a number cannot carry.
Why the usual numbers do not help you
Averages for restoration lifespan come from studies of many mouths, and they spread very widely at both ends. Two people can have the same crown placed on the same day and be in completely different positions a decade later.
What moves it is specific:
- Which tooth. A back tooth takes far more force than a front one.
- How much tooth was left before the repair. A restoration supported by solid tooth is in a better position than one holding together what remains of a heavily damaged one.
- Your gums. Recession exposes the edge of old work, and that edge is where trouble starts.
- Grinding. Clenching and grinding shortens the life of almost everything in the mouth.
- Cleaning, especially at the margin where the repair meets the tooth.
Notice that none of those is about the material. That is the point.
What actually ends a restoration
It is rarely the thing wearing out. It is usually one of these:
| What happens | Where it shows |
|---|---|
| New decay at the margin | The join between tooth and restoration — by far the most common reason |
| Fracture | The restoration itself, or the tooth around it, often in a grinder |
| The edge becoming exposed | Gum recession uncovering the junction, which then catches plaque |
| The tooth underneath | Nerve trouble developing in a tooth that was already heavily repaired |
| A seal that fails quietly | No symptoms at all, found on an X-ray or at a check |
The pattern is that the tooth usually fails before the material does. Which is why how you clean around old work matters more than what it was made of.
Age alone is not a reason to replace
This is the part worth reading twice.
Every time a restoration is replaced, a little more tooth goes with it. The old material has to be drilled out, and the drill cannot tell exactly where the filling ends and the tooth begins, so each round leaves the tooth slightly smaller. A tooth can go through that cycle only so many times before it needs a crown, and a crowned tooth can go through it only so many times before the nerve or the root is the problem.
So a crown that is fifteen years old, sealed, symptom-free and clean at the margin is not a problem to be solved. It is a restoration doing its job. "It's old" describes it; it does not diagnose it.
If you are told that sound older work should be replaced, asking what happens if you wait is a reasonable question, and so is asking to see the image.
When replacing it is the right call
- Decay at or under the margin. This is the common and genuine one.
- A crack, chip or lost portion, or a restoration that keeps coming loose.
- Floss that shreds every time at the same spot, which often means the edge is no longer smooth.
- Ongoing symptoms from that tooth that have another explanation ruled out.
- The tooth is being restored anyway for another reason, where replacing adjacent old work in the same visit avoids a second round of drilling later.
Cosmetic reasons are legitimate too — a front restoration that no longer matches the neighbouring teeth is a real reason to redo it. It is simply worth knowing that it is a cosmetic decision with a biological price, and deciding on that basis.
Work done in another country
Korean dentists treat restorations placed abroad routinely. Two things help:
- Say when and roughly what, if you know. Material and age change what a dentist expects to find underneath.
- Bring any images you have. A previous X-ray showing the same tooth a few years ago turns a guess into a comparison, which is the single most useful thing for judging whether something is changing or has simply always looked that way.
If you have no records at all, that is common and not a problem — it just means the first visit establishes the baseline rather than comparing to one.
What makes yours last longer
None of this is surprising, which is rather the point.
- Clean the margin, not just the surface. Floss or an interdental brush reaches the join; a toothbrush mostly does not.
- Deal with grinding if you grind. A night guard protects the work and the teeth holding it.
- Keep the gums healthy, because recession is what exposes edges.
- Get it checked, so a failing margin is found while it is still a small repair rather than a crown.
Implants follow different rules, and have their own guide.
At Seoul Lab Dental: when we look at existing work, we will tell you which of it is sound, which is worth watching and which genuinely needs redoing — and we will show you the image rather than ask you to take it on trust. If something can reasonably be left alone, that is what we will say.
Frequently asked questions
How long does a crown or filling last?
Published averages spread very widely and describe populations rather than your tooth. What moves it is which tooth it is, how much sound tooth was left before the repair, the state of your gums, whether you grind, and how well the margin is cleaned. None of those is about the material. A more useful question than how long it lasts is what would end it — and the answer is usually new decay at the join between tooth and restoration.
Should I replace an old filling or crown just because it is old?
Not on age alone. Every replacement takes a little more tooth with it, because the old material has to be drilled out and the drill cannot tell exactly where it ends. A tooth can go through that cycle only so many times before it needs a crown, and a crowned tooth only so many times after that. A restoration that is sealed, symptom-free and clean at the margin is doing its job regardless of its age.
When does an old restoration genuinely need replacing?
When there is decay at or under the margin; when it is cracked, chipped or repeatedly coming loose; when floss shreds at the same spot every time, which often means the edge is no longer smooth; when the tooth has ongoing symptoms with other causes ruled out; or when the tooth is being restored anyway and redoing adjacent work in the same visit avoids a second round of drilling later.
Can a Korean dentist work on a crown that was made abroad?
Yes, routinely. It helps to say when it was done and roughly what it is made of if you know, since material and age change what a dentist expects to find underneath, and to bring any images you have — a previous X-ray of the same tooth turns a guess into a comparison. Having no records is common and not a problem; it simply means the first visit sets the baseline instead of comparing to one.
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