A filling is the smallest repair in dentistry, and on a site that spends a lot of time on complicated work it is worth giving it its own page, because the whole point of the rest of it is to need less of it.
When decay is found early enough, a filling is the entire treatment. The tooth keeps its walls, keeps its shape, and keeps doing its job. Nothing larger gets planned, nothing gets sequenced, and you are done in one appointment.
We place composite
Every filling we place is composite, the tooth-colored material. There is no long menu here and there does not need to be one.
Composite bonds to the tooth. That is the property that matters most, because it means the preparation can be limited to the part that is actually decayed rather than cut to a shape that will hold a filling in place mechanically. The repair follows the damage instead of the other way around, which is the same instinct that runs through the rest of what we do: keep what is yours, because enamel is the one thing in your mouth that cannot be replaced with something better.
Small is the whole idea
Most of the fillings we place are small, and that is deliberate rather than lucky. Decay caught early, while the lesion is still shallow, needs a small repair. The same decay found two years later frequently does not, because by then it has undermined enough of the tooth that a filling is no longer the right answer.
This is the unglamorous argument for keeping up with examinations and X-rays, and it is the only argument that really matters. The gap between a small filling and a crown is often just time.
It is also why we take photographs and X-rays as a matter of course rather than on request. A lesion between two teeth is invisible to you and frequently invisible to us without an image, right up until the point where it is large enough to feel. You cannot make an early decision about something you have not found yet.
Repairing around an existing crown
This one comes up constantly and almost nobody writes about it.
A crown does not decay, but the tooth where the crown meets it can, and over a long enough life most people end up with a margin somewhere that starts to go. It becomes more common with age, as gums recede and the root surface below a crown becomes exposed, and it is one of the most frequent things we find in patients who have had good dentistry done decades ago.
What to do about it is a judgment call, and the honest version is this:
- Ideally the crown gets replaced. That is the definitive answer, it deals with the whole margin rather than one part of it, and it starts the clock again.
- But if it is caught early, a repair can extend the life of the crown. A small composite repair at the margin, done while the decay is still limited, can add years of service to a crown that is otherwise perfectly good.
Which way a particular case goes depends on how far the decay has gone, how much sound tooth is left around it, how the rest of the crown is doing, and frankly on what makes sense for the person in the chair. For an older patient with a crown that is serving them well, turning a crown replacement into a small repair is a genuinely good outcome rather than a compromise.
The word doing the work in that sentence is early. A margin caught on a routine X-ray is a candidate for a repair. The same margin found because the tooth started hurting usually is not, and by then the conversation is about replacing the crown, or occasionally about whether the tooth can be kept at all. This is what the recall schedule is buying you.
When a filling is no longer the right answer
A filling restores a tooth. It does not reinforce one. Once enough of the tooth is gone, adding more filling material stops helping and starts creating a tooth that is mostly repair, held together at the edges.
The signs that the line has been crossed:
- There is now more filling than tooth.
- The remaining walls are thin enough to flex or crack under load.
- A crack line is already running through the tooth.
- The tooth has had a root canal on a back tooth.
At that point the conversation moves to an onlay or a crown, and which of those it is depends on how much sound structure is still standing. We go through that reasoning in detail on the crowns page, including why we still place onlays when the tooth suits one.
What to expect, and how long it lasts
A filling is usually one appointment. The tooth is numbed, the decay is removed, the composite is bonded in layers and shaped, and the bite is checked before you leave. Expect the tooth to be a little sensitive to cold for a few days, particularly if the cavity was deep.
What eventually ends a filling is almost always the same thing that ended the tooth’s luck in the first place: new decay, usually starting at the edge where the filling meets the tooth. Fillings also chip, and a filling in a mouth that grinds heavily has a harder life than one that does not.
Two things extend them more than anything we do at the appointment: what happens at home, and being seen often enough that a small problem is found while it is still small.
If something feels rough, sharp, or sensitive
A filling that feels high when you bite, an edge that catches your tongue or your floss, or sensitivity that is getting worse rather than settling over a week or two is all worth a call. These are quick things to adjust and they are much easier to sort out early. Call us at 702-734-0776.