Some mild sensitivity for a few days to two weeks after a new filling is normal, especially to cold or biting pressure. Most of it resolves on its own. Sensitivity that gets worse over time, hurts when you release your bite, or lasts more than two to three weeks usually means something needs a quick adjustment.
Dr. Zack Finnegan, DMD at Magnolia Smiles in Woodstock, GA sees this often, and most cases are simple fixes when caught early. This guide covers what is normal, what is not, and when to call.
Why a tooth is sensitive right after a filling
Placing a filling is a bigger event for the tooth than it looks.
- Local anesthetic wears off and the numbing is replaced by mild tenderness for a day or two.
- Small amounts of trauma to the tooth from drilling and preparation cause the inner tissue to react briefly.
- The bond between filling and tooth is still stabilizing for the first few days.
- The tooth is adjusting to the new material and shape.
For most fillings, sensitivity to cold or pressure fades meaningfully within 3 to 7 days and is essentially gone within 2 weeks.
What is normal
- Mild cold sensitivity. A quick, sharp response to cold water or air that goes away within a second or two.
- Mild pressure tenderness. Chewing on that tooth feels different for a few days.
- Slight ache after the anesthetic wears off. Resolves within a day or two.
Over-the-counter pain relievers help. Ibuprofen (if you can take it safely) works well because it addresses inflammation. Follow the label.
What is not normal
Call the office if any of these show up.
The bite feels high
If the tooth feels like it hits the opposing tooth before your other teeth do, the filling may be sitting slightly proud. This is one of the most common reasons for lasting sensitivity after a filling. The fix is a quick bite adjustment, usually five minutes in the chair with no numbing needed. This one is not something to just “get used to.” Call.
Sharp pain when you release your bite
Pain when you finish biting down (rather than during the bite) often points to a small crack in the tooth or a bond that is not sealing. The tooth may need re-treatment or, in some cases, a crown.
Lingering pain to cold
A cold response that lasts more than 5 to 10 seconds after the cold is gone suggests the pulp (nerve) is inflamed. Sometimes this settles in a few weeks. Sometimes it points to a tooth that needs a root canal. Call if it is not improving.
Spontaneous throbbing pain
Pain that shows up on its own, especially at night, suggests pulpitis. This usually needs a root canal. Do not wait it out.
Sensitivity that gets worse over weeks
Pattern matters. Sensitivity that improves each day is normal. Sensitivity that plateaus or worsens is not.
Swelling in the face, gum, or jaw
Not normal. Call the same day.
What the fix usually is
- High bite: a bite adjustment. Five minutes, no numbing, immediate relief.
- Small crack detected on the tooth: may need a crown or, if it extends into the pulp, a root canal.
- Persistent pulpitis: may resolve with time, or may need a root canal. An exam and X-ray decide.
- Failed bond: the filling is redone.
- New decay or fracture: additional treatment as needed.
Most cases are the first one: a bite adjustment.
Practical home care while it settles
- Ibuprofen or acetaminophen as needed.
- Avoid biting hard or crunchy food on that tooth.
- Avoid very hot or very cold drinks.
- Rinse gently with warm salt water twice a day.
- Brush and floss normally, but be gentle around the tooth.
- Sensitive-teeth toothpaste can help modest cold sensitivity that lingers a couple of weeks.
What Magnolia Smiles does
- Detailed bite check at the end of every filling.
- Follow-up call or check if sensitivity is expected to be higher than usual (deep filling, close to nerve).
- Fast bite adjustment appointments when needed.
- Written treatment plan if a filling turns out to need more (crown or root canal).
Learn more about tooth-colored fillings at Magnolia Smiles or restorative dentistry in Woodstock, GA.
Frequently asked questions
Should I take pain medication after a filling?
Over-the-counter ibuprofen is often enough for the first day or two, especially for a deep filling.
Is it normal for a filling to hurt when I bite for weeks?
No. That is a bite that needs adjusting, or a crack in the tooth. Call.
Will the tooth eventually need a root canal?
Most sensitive fillings resolve without a root canal. Deep fillings close to the nerve have a higher chance of needing one within the first year or two.
Can I chew normally right after a filling?
Once the numbing wears off. Start soft and see how the tooth responds.
What if the filling comes out?
Call the office. A missing filling should be replaced within a week or two so decay does not restart under the exposed tooth.
Do amalgam fillings cause sensitivity too?
Yes, similar range. Both materials can cause short-term sensitivity that usually resolves.
Ready to have it looked at?
If the sensitivity is not improving, or the bite feels off, do not wait. Most fixes are quick. Contact Magnolia Smiles to book.
Reviewed by Dr. Zack Finnegan, DMD. Magnolia Smiles, Woodstock, GA. This article is for general education and does not replace an in-person exam.