In plain English
What a cavity filling involves
A filling repairs a tooth that decay has damaged. Decay is caused by bacteria whose acids soften enamel and then the dentin beneath it, and once a real hole has formed the tooth cannot grow that structure back. The dentist removes the softened, decayed portion, cleans the space and packs it with a material that restores the shape of the tooth and seals bacteria out. Two materials do most of the work. Composite is a tooth-colored resin that is bonded to the tooth in layers and hardened with a blue light. Amalgam is a silver-colored metal mixture that is pressed into place and sets on its own. Fillings are also used to replace old ones that have worn or broken, to patch a small chip, and to rebuild surfaces flattened by grinding. The larger purpose is to stop a cavity while it is still small, before it reaches the nerve and calls for more involved treatment.
- 01
Exam and X-ray
The dentist checks the tooth with a mirror and probe and looks at X-rays, which reveal decay between teeth and under old fillings that cannot be seen directly. This sets how large the filling is likely to be.
- 02
Numbing
Local anesthesia is given for most fillings and allowed a few minutes to work. A very shallow cavity confined to enamel sometimes needs none. Tell the dentist if you would prefer to be numbed regardless.
- 03
Removing the decay
A drill, or in some offices a laser, removes the decayed tooth structure. The dentist stops when the remaining surface is hard and sound, checking with an instrument as they go.
- 04
Cleaning and preparing the tooth
The space is rinsed and dried. For a composite filling the surface is treated with a mild etching gel and a bonding liquid. For a cavity between teeth, a thin band is fitted around the tooth to form the missing wall.
- 05
Placing and hardening the material
Composite goes in a layer at a time, each one set with a curing light for a few seconds. Amalgam is packed in and carved while still soft. The tooth must stay dry throughout.
- 06
Shaping and checking the bite
The filling is trimmed to match the grooves of the tooth. You bite on colored paper so high spots show up, and those are smoothed down before a final polish.
Who it is usually for
A filling is the usual recommendation for a cavity that has broken through the enamel, for an old filling that has cracked, leaked or worn down, for a small chip, and for wear caused by grinding. If the decay is very early and still within the enamel, a dentist may suggest fluoride and watching it instead. When too much of the tooth is gone for a filling to hold, the alternatives are a lab-made inlay or onlay, or a crown. If decay has reached the nerve, a root canal is typically needed before the tooth is restored. Your dentist judges which applies from the X-ray and from what is found once the decay is removed.
Fig. 2 — What to expect
What to Expect During Cavity Filling
- 01Local anesthesia to numb the area
- 02Decay removed with a drill or laser
- 03Tooth cleaned and prepared
- 04Filling material placed and shaped
- 05Material hardened with special light (composite)
Before you agree to it
Questions to ask about your cavity filling
Questions about my cavity filling
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Table 1 — Common reasons
When You Might Need Cavity Filling
- ACavities from tooth decay
- BWorn or broken fillings
- CChipped teeth
- DTeeth grinding damage
Table 2 — Recovery after Cavity Filling
Recovery After Cavity Filling
When can you resume normal activities? Here's a quick guide:
| Activity | Wait |
|---|---|
| Use a Straw | When numbness wears off |
| Eat Normally | 1-2 hours |
| Smoke | 4+ hours |
| Drink Alcohol | 1 hour |
| Drive | Immediately (if no sedation) |
| Exercise | Immediately |
Table 3 — Common questions
Frequently Asked Questions About Cavity Filling
Does getting a filling hurt?
With local anesthesia most people feel vibration and water spray but no pain. The injection itself is a brief pinch. Afterward the tooth can be sensitive to cold or to biting for a short while. If you felt pain during the drilling, tell the dentist straight away, because more anesthetic can be given.
What is the difference between silver and white fillings?
Silver fillings are amalgam, a metal mixture that is durable, tolerant of moisture during placement and plainly visible. White fillings are composite resin, matched to the tooth and bonded to it, which often lets the dentist remove less tooth. Each suits some situations better than others, so ask your dentist why a particular one is being suggested.
Why is my tooth sensitive after a filling?
Some sensitivity to cold, air or pressure is common after a filling, particularly a deep one, and usually fades. A filling that sits slightly high can make the tooth sore to bite on and needs a quick adjustment. Call your dentist if the sensitivity is getting worse, throbs on its own or keeps you awake.
How long does a cavity filling take?
A cavity filling typically takes 30-60 minutes and requires 1 visit. The exact duration depends on the complexity of your case and whether any complications arise.
How much does a cavity filling cost?
A cavity filling typically costs between $150 and $400, with an average of $250. With dental insurance that covers it, out-of-pocket cost is often around $50–$100, depending on your plan, deductible and annual maximum. Factors affecting cost include your location, the dentist's experience, and case complexity.
Does a cavity filling hurt?
During the procedure, you shouldn't feel pain because local anesthesia is used to numb the area. Pain level during recovery is typically rated 1/5. Some discomfort, sensitivity, or soreness is normal for a few days after the procedure and can usually be managed with over-the-counter pain relievers.
Medical disclaimer
The information provided on Urgent Dental Helper is for general informational and educational purposes only. It is NOT intended to be a substitute for professional medical or dental advice, diagnosis, or treatment. Urgent Dental Helper is not a dental practice, and nothing here has examined your mouth. Always see a licensed dentist, physician, or other qualified health provider in person about any dental or medical condition. Never disregard professional advice or delay in seeking it because of something you have read or any result you received on this website.