Why does a tooth feel sensitive after a filling?
A few reasons can explain why your tooth reacts after a filling:
- Nerve irritation: During the filling process, the dentist drills into the tooth to remove decay. That action can sometimes irritate the tooth’s nerves. This irritation doesn’t always cause long-term trouble, but it can take time for the nerve to settle.
- Filling height: If the new filling sits a little too high, your bite may feel off. Even a slight imbalance can cause sensitivity or soreness when you chew. This issue often becomes noticeable when you bite down on food.
- Filling material: Some materials—such as metal or composite—conduct temperature more easily. That means they may react more strongly to hot soup or ice water than your natural tooth enamel.
- Hidden problems: In some cases, the cavity might go deeper than expected, or a crack in the tooth may remain unnoticed. These issues could lead to longer-lasting sensitivity or pain even after the filling.
What does sensitivity feel like?
Tooth sensitivity after a filling often feels like a sudden, sharp sensation. You may feel it when you drink something cold or hot, eat sweet foods, or even breathe in cold air. Some people also notice pain while brushing or biting down.
How long should the sensitivity last?
Mild discomfort usually fades in a few days to two weeks. During this time, your tooth adjusts to the new filling material, and the nerve calms down. If the sensitivity gets better each day, you’re on the right track. But if the pain sticks around for more than two weeks, or if it worsens, you should reach out to your dentist. That kind of lingering discomfort might point to something that needs further attention.
Also, don’t ignore sharp pain when biting or pressure that feels different from the rest of your teeth. These symptoms could mean the filling needs an adjustment.
When should you call the dentist?
Not every twinge after a filling needs a dental visit. But here are signs that you shouldn’t ignore:
- Sensitivity that lasts longer than two weeks
- Sharp pain when you chew or bite
- Discomfort that worsens instead of improving
- Sensitivity to hot, cold, or sweet foods that feels more intense than before the filling
- Swelling, bad breath, or a strange taste near the filled tooth
Your dentist may need to smooth out the filling, apply a protective coating, or explore deeper problems like a crack or infection.
How can you ease tooth sensitivity after a filling?
If your tooth feels sensitive but your dentist says everything looks fine, you can take simple steps at home to ease the pain:
- Use desensitizing toothpaste
Switch to a toothpaste made for sensitive teeth. Look for one with potassium nitrate, such as Sensodent K or Sensodent KF. These help block signals from the tooth to the nerve, which reduces pain over time. - Rinse with warm salt water
Mix a teaspoon of salt into a glass of warm water and swish it gently. This natural remedy soothes inflammation and keeps bacteria in check. - Avoid trigger foods for a few days
Skip very hot, cold, sweet, or acidic foods while your tooth heals. Try to eat with the opposite side of your mouth if only one side feels sensitive. - Brush gently
Use a soft-bristled toothbrush and avoid scrubbing too hard. Gentle brushing protects your enamel and helps the area heal without extra irritation. - Cut back on acidic drinks
Sodas, citrus juices, and energy drinks can weaken enamel and increase sensitivity. Cut back on them until your tooth feels better. - Watch out for teeth grinding
If you often wake up with a sore jaw or headache, you might grind your teeth at night. Let your dentist know. A custom mouthguard can protect your teeth and reduce pressure on your fillings.
Tooth sensitivity after a filling might feel surprising, but it doesn’t always mean something went wrong.
Your tooth may just need time to settle. With gentle care and the right products, the pain usually fades within a week or two.
Still, you know your body best. If something doesn’t feel right or the discomfort lingers, call your dentist. A small adjustment or follow-up treatment could make a big difference and help you feel better fast.
