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A tooth-colored filling is composite resin bonded into a tooth where decay or a fracture has been removed, shaped to the tooth and polished to match. It is the most common restoration we place. At Vizcaya Dental Arts we place most composite fillings under a rubber dam, which keeps the tooth dry while the filling bonds, and we do not fill every dark spot we see: shallow decay in the enamel is often watched rather than drilled.
Fill it or watch it?
Not every stain or shadow is a cavity that needs a filling. Teeth pick up small spots and stains over the years, and every filling eventually stains a little at its edges. Decay that is still confined to the enamel, the hard outer layer, can often be halted with better cleaning between the teeth and fluoride, and in a patient who comes regularly we watch a shallow spot rather than drill it.
Once decay has reached the dentin underneath, it needs to be cleaned out and restored, because it will not stop on its own. The decision is made with you, on the evidence, and recorded so it can be rechecked.
When composite is the right choice
Composite is a very good material with limits. It is less wear-resistant than enamel. On a small filling that does not matter. When composite has to cover most of the chewing surface of a back tooth, the tooth meets its opposite number with resin instead of enamel, the resin wears faster, and over years the bite can shift. In those cases a crown protects the tooth better, and we recommend one rather than a large filling that will need redoing.
Position matters too. A filling that extends below the gum is hard to keep dry and hard to clean, and those fail early. Sometimes a large composite is still the right call:
- As a medium-term solution, when the bite allows
- For a younger patient who is not ready for a crown
- As a stage in a longer plan
We explain which it is in your case.
Why we use a rubber dam
Composite does not tolerate moisture. It bonds to tooth structure only when the surface is clean and dry, and a mouth, with saliva, breath and the tongue, is none of those. A rubber dam is a thin sheet of latex-free material stretched over a small frame with the tooth poking through, isolating it from everything else.
We use a rubber dam for most composite restorations. It takes a minute to place, and in our experience the fillings last longer because the bond was made in dry, clean conditions. You also do not taste the materials or swallow water and debris, and most patients find the visit easier for it. Many good dentists work without one; this is how we do it.
The visit
- Step 1 of 5 Numbing
A topical gel, then local anesthesia given slowly. You should feel nothing sharp during the work; if you do, raise a hand and we stop.
- Step 2 of 5 Isolation
The rubber dam goes on, and the tooth is clean and dry for the rest of the visit.
- Step 3 of 5 Removing the decay
Only the decayed or fractured part is removed, keeping as much healthy tooth as possible.
- Step 4 of 5 Bonding and building
The surface is conditioned and a bonding agent applied. The composite goes in thin layers, each shaped and hardened with a blue light, matched to the shade of your tooth.
- Step 5 of 5 Finishing
The dam comes off, the bite is checked and adjusted so the tooth meets its neighbors exactly as before, and the surface is polished.
Allow about an hour for one or two fillings. Some sensitivity to cold or biting for a few days is normal while the tooth settles; if it persists, we check the bite and the filling.
Fillings on front teeth
A chipped corner or a cavity on a front tooth is restored with the same composite, layered to match the color and translucency of the tooth. The same rules apply: a healthy bite, no habits that load the edge, and the understanding that composite on a front edge can chip again if the tooth is used as a tool. For larger cosmetic changes on front teeth, where shape or length is the goal, our composite bonding page describes the approach.
Signs a filling needs attention
Fillings do not usually fail with pain. Watch for:
- Floss that catches or shreds at one tooth
- A dark line or shadow at the edge of a filling
- A rough spot your tongue keeps finding
- New sensitivity to sweet or cold
- A tooth that hurts on biting and release, which can mean a crack beside the filling
None of these is an emergency, but each is worth a look at your next visit. A small edge defect can be repaired. Left alone, it grows into a replacement filling or a crown.
Repair or replace?
When a filling develops a defect, the question is whether to repair the spot or replace the whole filling. If the rest of the filling is sound and well bonded, a repair is a good, minimally invasive option. If the defect suggests the whole filling was placed under poor conditions, for example without isolation, the rest may be compromised too, and since the tooth is already numb, replacing the entire filling can be the safer course. We look at the actual filling and recommend one or the other.
We do not replace sound amalgam fillings because they are amalgam. A small, intact silver filling can serve for a lifetime, and every replacement removes a little more tooth. Unless there is a crack, decay underneath, a leaking margin or a cosmetic concern on a visible tooth, we leave good fillings alone.
Making a filling last
Fillings fail at the edges, where plaque sits.
- Cleaning between the teeth every day is the single thing that extends a filling’s life, and we show you how if flossing has never worked for you.
- Keep your check-ups so that a small edge defect is caught while it can still be repaired.
- Every time a tooth is refilled, a little more of it is gone, and a tooth can only be restored so many times before there is not enough left for a filling. That is the reason for not filling what does not need it.
Frequently asked questions
Does getting a filling hurt?
No. The tooth is numbed with local anesthesia, given slowly after a topical gel, and you feel vibration and pressure but not pain. Afterward the tooth may be a little sensitive to cold or to biting for a few days while it settles; if it lasts longer than a couple of weeks, we check it.
How long do composite fillings last?
Many years with good care, and we do not put a number on it, because it depends on the size of the filling, where it sits, your bite and above all how well you clean between the teeth. Fillings rarely fail on their own; decay at the edges, cracks and heavy wear are what end them.
Should I replace my silver fillings with white ones?
Not just because they are silver. A small, intact amalgam filling can last the rest of your life, and removing it takes more tooth with it. We replace amalgam when it is cracked, leaking, decayed underneath, or when a front-visible one bothers you cosmetically, not on principle.
Why do you use a rubber dam?
Composite bonds only to a clean, dry surface, and a mouth is neither. The dam is a thin sheet that isolates the tooth from saliva and breath, so the bond is made in dry conditions. In our experience the fillings last longer for it, and it also keeps water and debris out of your mouth during the work.
Can I eat right after a filling?
The composite is fully hard when you leave, so you can eat once the numbness wears off. Avoid chewing on the numb side until feeling returns, so you do not bite your cheek or tongue.
Filling or crown?
Size and position decide. A smaller cavity above the gum line is a filling. When composite would have to cover most of the chewing surface, or reach below the gum, it tends to wear and leak, and a crown protects the tooth better in the long run. We do not rush to crowns, but we do say when a filling would be a short-term fix.
Sources
Professional guidelines and peer-reviewed reviews this page draws on.
- Miao C, Yang X, Wong MC, et al. Rubber dam isolation for restorative treatment in dental patients. Cochrane Database of Systematic Reviews. 2021;5:CD009858. Cochrane
- Worthington HV, Khangura S, Seal K, et al. Direct composite resin fillings versus amalgam fillings for permanent posterior teeth. Cochrane Database of Systematic Reviews. 2021;8:CD005620. Cochrane
