Broken or Lost Filling: What to Do and When the Tooth Needs Attention

A filling can chip, crack, wear down, or come out completely.

Sometimes the change is obvious because you feel a hole or find a piece of material. Other times the first sign is a rough edge, food trapping, sensitivity, or pain when chewing.

A broken filling is not always an emergency, but it should be evaluated because the remaining tooth may be less protected.

Why do fillings break or fall out?

Possible reasons include:

• Normal wear over time
• New decay around the filling
• Heavy bite forces
• Teeth grinding or clenching
• Biting a very hard object
• A crack in the surrounding tooth
• A large restoration with limited remaining tooth structure

No filling lasts forever. The ADA notes that tooth-colored composite restorations can wear and require replacement over time. MouthHealthy: Tooth-Colored Fillings

Our guide on how long dental fillings last explains why replacement timing varies by material, size, tooth location, and bite.

What should you do if a filling falls out?

Call a dentist and describe what happened.

Until the tooth can be checked:

• Keep the area clean with gentle brushing
• Rinse with water after meals if food collects there
• Avoid chewing hard or sticky foods on that side
• Do not pick at the cavity or rough edge
• Do not try to permanently glue a filling back into the tooth

If you saved the filling material, you can bring it with you, but the dentist may not be able to reuse it.

Why can the tooth become sensitive?

A filling covers and protects prepared tooth structure. If part of it is missing, dentin may be exposed to temperature, sweets, air, or pressure.

Sensitivity does not tell you whether the problem is minor.

MouthHealthy lists worn fillings, cavities, fractures, gum disease, worn enamel, and exposed roots among causes of sensitivity. MouthHealthy: Sensitive Teeth

If the pain is lingering, spontaneous, severe, or getting worse, the tooth needs prompt evaluation.

What if it hurts when you bite?

Pain with chewing can come from a loose restoration, decay, a crack, or inflammation involving the pulp or tissues around the root.

The American Association of Endodontists specifically lists a loose filling or crack among possible causes of sharp pain when biting. AAE: Tooth Pain

Do not keep testing the tooth by biting hard on it.

Can the filling simply be replaced?

Sometimes, but not always.

The dentist may need to remove weakened material and check:

• How much healthy tooth remains
• Whether new decay is present
• Whether the tooth is cracked
• How close the defect is to the pulp
• Whether the bite is contributing
• Whether a new filling will have enough support

A small defect may be repaired with another direct restoration. A more heavily damaged tooth may need an onlay, crown, root canal treatment, or another plan.

Gateway Dental offers restorative dentistry for damaged and decayed teeth.

When could a crown be considered?

A crown may be discussed when the remaining tooth is too weakened for another filling to provide predictable support.

This is not based only on the age of the filling.

Our crown vs. filling guide explains how remaining structure and chewing forces influence the choice.

Could a lost filling lead to a root canal?

Not automatically.

If the pulp inside the tooth becomes inflamed or infected because of deep decay, a crack, or bacterial leakage, root canal treatment may become necessary.

But a missing filling by itself does not diagnose a pulp problem.

Our guide on when a root canal may be needed explains the symptoms and examination findings dentists consider.

When should you seek urgent care?

Call promptly if you have:

• Severe or worsening pain
• Swelling
• Fever
• Drainage or a bad taste from the area
• A tooth that fractured with the filling
• Significant pain with biting
• A sharp edge cutting the cheek or tongue

Rapidly increasing facial swelling or difficulty breathing or swallowing requires urgent medical attention.

Do not wait for pain

Some broken fillings are painless at first.

Repair is often simpler when the problem is evaluated before more tooth structure fractures or decay progresses.

If a filling feels rough, moves, traps food, or has changed color around its edge, mention it at your dental visit even if it does not hurt.