By Dr. Liyan Massaband, DMD, MPH · Last updated: 29 Sept 2026
Quick answer: Mild sensitivity after a filling is normal and usually fades within a few days to two weeks. After a deep filling close to the nerve it can take up to about four weeks, but it should get a little better each week. Pain when you bite down usually means the filling is slightly high and needs a quick adjustment. Call your dentist if the pain gets worse, lingers long after cold or hot is gone, throbs on its own, or wakes you at night. These are signs of irreversible pulpitis, which usually needs a root canal.
Key takeaways
- Short, sharp twinges with cold or sweet that stop quickly are normal healing.
- A tooth that hurts when you bite together is often just a high filling. It is a quick fix, so don’t wait it out.
- Pain that lingers, throbs or starts on its own is not normal. Call your dentist.
- The deeper the cavity, the longer the tooth may take to settle.
- New pain months or years after a filling usually has a new cause and needs an exam.
Why Does a Tooth Hurt After a Filling?
A filling repairs the tooth, but the process of getting there irritates it. Removing decay exposes thousands of microscopic tubes in the dentin that lead toward the nerve (pulp). The drilling produces a little heat and vibration, and the filling material itself changes how temperature and pressure reach the inside of the tooth. The nerve responds with a short period of inflammation.
How much a tooth reacts depends mostly on how deep the cavity was. A small filling in the enamel may cause no sensitivity at all. A filling that reached close to the nerve can leave the tooth sensitive for several weeks while it calms down.
Other common reasons for discomfort after a filling:
- A high bite. If the filling is even slightly taller than the tooth around it, it takes more force every time you bite.
- Sore gums from the numbing injection, or from the band or clamp used to shape the filling
- A sore jaw from keeping your mouth open for a long time
- Referred pain. Nerves share pathways, so neighboring teeth can ache too.
- Galvanic shock. A brief “zap” when a new metal filling touches another metal, such as a fork or an older filling. It is rare and usually fades quickly.
How Long Should a Tooth Hurt After a Filling? A Timeline
| Time after the filling | What is normal | Call your dentist if |
| First few hours | Numbness wearing off; mild ache as it fades | Severe pain once the numbness is gone |
| Days 1 to 3 | Tender gums; mild sensitivity to cold, sweet or biting | You cannot bite without pain, or the bite feels “off” |
| Week 1 to 2 | Sensitivity steadily fading | Pain is the same or getting worse |
| Weeks 2 to 4 (deep fillings) | Occasional brief twinges that keep getting milder | Pain that lingers after cold or heat, or throbs on its own |
| After a month | Tooth feels normal | Any ongoing pain or sensitivity |
| Months or years later | No pain | New pain, which usually means a new problem |
The rule to remember: improving is normal, and staying the same or getting worse is not.
Normal Sensitivity vs. Signs of a Problem
| Probably normal | Needs a dental visit |
| Sharp twinge with cold or sweet that stops within a few seconds | Pain that lingers well after the cold or heat is gone |
| Mild tenderness when chewing in the first few days | Sharp pain every time you bite down |
| Sensitivity that is milder each week | Pain that is getting worse |
| Aching gums near the tooth for a few days | Throbbing pain that starts on its own |
| A neighboring tooth feeling a little sensitive | Pain that wakes you at night |
| Swelling of the gum or face, or a bad taste |
Pulpitis After a Filling: Reversible or Irreversible?
Pulpitis simply means inflammation of the pulp, the nerve and blood supply inside the tooth. Some pulpitis after a deep filling is expected. What matters is whether the pulp can recover. Dentists use this distinction, set out in the American Association of Endodontists’ diagnostic terminology, to decide on treatment.
| Reversible pulpitis | Irreversible pulpitis | |
| What it means | The pulp is irritated but can heal | The pulp is too inflamed to recover |
| Cold or sweet | Short, sharp pain that stops within seconds once the trigger is gone | Pain that lingers for a long time after the trigger is gone (often 30 seconds or more) |
| Heat | Usually fine | Often hurts; cold water may even soothe it |
| Pain on its own | No | Yes, often throbbing, and may wake you at night |
| Trend | Improves over days to weeks | Stays the same or gets worse |
| Treatment | Time, desensitizing care, sometimes a bite adjustment or a new filling | Root canal therapy, or removing the tooth |
How long does reversible pulpitis last?
Once the cause is dealt with, reversible pulpitis usually settles within a few days to a few weeks. After a very deep filling it can take longer, sometimes up to a couple of months, but the tooth should keep improving. If it plateaus or worsens, the pulpitis may be turning irreversible, and your dentist will want to test the tooth.
Can a filling cause a tooth to need a root canal?
The filling itself does not damage the nerve. But when decay has already reached close to the pulp, the nerve may have been more inflamed than it looked, and occasionally it does not recover even after a perfect filling. This happens more often with very deep cavities and teeth that already had symptoms before the filling. Learn the other signs you need a root canal.
Pain When Biting After a Filling: The High Filling
This is one of the most common reasons a tooth hurts after a filling, and one of the easiest to fix. While you are numb, it is hard to feel whether your bite is exactly right. If the filling is slightly high:
- The tooth hurts when you bite or chew, but may feel fine at rest
- Your teeth may meet on that tooth first when you close
- The tooth can become more tender over time, because the ligament around it is being bruised
Don’t wait for it to settle. A high filling rarely fixes itself. The adjustment takes a few minutes and usually brings relief within a day or two.
If biting pain comes as a sharp jolt, especially when you release your bite, the tooth may be cracked. Cracks are common in teeth with large fillings and are covered in our guide to fixing a broken tooth.
Why Does My Tooth Hurt Months After a Filling?
Pain that appears months or years after a comfortable filling usually has a new cause:
- New decay at the edge of or under the filling
- A crack in the tooth or a broken filling
- A worn or leaking filling that lets bacteria in
- Clenching or grinding that overloads a heavily filled tooth. A night guard can help.
- A nerve that has slowly died after a deep cavity, which can lead to an infection
Any of these needs an exam and usually an X-ray. See our guide to cavities for how decay under fillings is treated.
How to Relieve Tooth Pain After a Filling at Home
- Use a desensitizing toothpaste with potassium nitrate or stannous fluoride. Brush with it twice a day, and dab a little on the tooth at night without rinsing.
- Avoid very hot, cold, sweet and acidic foods and drinks for a week or two. Drink cold drinks through a straw.
- Brush with a soft brush and gentle pressure.
- Chew on the other side for a few days.
- Take an over-the-counter pain reliever if needed. The American Dental Association recommends ibuprofen, alone or combined with acetaminophen, as the first choice for dental pain. Follow the label, and check with your doctor if you have health conditions.
- Hold off on teeth whitening until the sensitivity has completely gone.
Home care helps normal sensitivity. It will not fix a high filling, a crack or irreversible pulpitis.
What Your Dentist Can Do
Depending on what they find, your dentist may:
- Adjust the bite by smoothing a high spot on the filling
- Apply a desensitizing agent or sealant to the tooth
- Replace the filling, sometimes with a protective liner underneath if the cavity was very deep
- Place a crown if the tooth is cracked or the filling is too large for the remaining tooth
- Recommend root canal treatment if the pulp cannot recover
Does the Type of Filling Make a Difference?
- Tooth-colored (composite) fillings are bonded to the tooth. After deep fillings, some people notice sensitivity to biting or cold for a short time. The ADA’s guide to composite fillings explains how they work. See our tooth-colored fillings page for details.
- Silver (amalgam) fillings conduct temperature, so some people notice cold sensitivity at first. The FDA considers amalgam safe for most people, but recommends alternatives for some higher-risk groups, such as pregnant women and young children.
- Either way, the depth of the cavity matters much more than the material.
Worried about the procedure itself? Read do cavity fillings hurt?
When to Call Your Dentist
Call within a few days if:
- Biting hurts, or your bite feels uneven
- Sensitivity is not improving after two weeks
- Cold or heat causes pain that lingers
Call the same day if:
- The pain throbs on its own or wakes you up
- You notice swelling of the gum or face, a bad taste or a gum bump
- The filling has cracked or fallen out
For urgent problems, see our emergency dentist page.
Tooth Pain After a Filling? We Can Help in Beverly Hills
At ConfiDental Beverly Hills we check the bite on every filling before you leave, and we are always happy to see you again if something doesn’t feel right. Many post-filling problems take just a few minutes to fix. If the pain turns out to be something deeper, we explain your options clearly and help you choose.
Book a visit or call (310) 858-9212.
Frequently Asked Questions
How long should a tooth be sensitive after a filling?
Usually a few days to two weeks. After a deep filling it can take up to about four weeks, but it should improve steadily.
Is it normal for a tooth to throb after a filling?
A mild ache for a day or two can happen. Throbbing that starts on its own, lingers or wakes you at night is not normal and may be irreversible pulpitis. Call your dentist.
Why does my tooth hurt when I drink cold water after a filling?
The dentin under the filling is still sensitive while the nerve settles. Brief twinges are normal. Pain that lingers after the cold is gone needs checking. Read more about why teeth become sensitive to cold.
Why does my tooth hurt when I bite down after a filling?
Most often the filling is slightly high. A quick adjustment usually fixes it. Sharp pain when you release your bite can mean a crack.
How long does pulpitis last after a filling?
Reversible pulpitis usually settles within days to a few weeks, and sometimes longer after a very deep filling. Irreversible pulpitis does not go away on its own and needs treatment.
How do you treat pulpitis after a filling?
Reversible pulpitis is treated with time, desensitizing care and sometimes a bite adjustment or a new filling. Irreversible pulpitis is treated with a root canal or extraction.
Can a filling be too deep?
When decay reaches close to the nerve, the filling has to go deep too. Your dentist may place a protective liner. Deep fillings are more likely to cause longer sensitivity, and occasionally a root canal later.
Is it normal for other teeth to hurt after a filling?
Yes, for a short time. Pain can be referred to neighboring teeth. If it continues, the other tooth should be checked.
Why do my gums hurt after a filling?
The injection site or the band used to shape the filling can leave the gum sore for a few days. Warm salt water rinses help.
Why does my jaw hurt after a filling?
Keeping your mouth open for a long appointment can strain the jaw muscles and joint. It usually settles within a few days. If it doesn’t, see our guide to jaw pain on one side.
Is swelling normal after a cavity filling?
Slight gum puffiness near the tooth can happen. Facial swelling is not normal and may mean an infection, so call your dentist the same day.
About the Author
Dr. Liyan Massaband, DMD, MPH leads ConfiDental Beverly Hills. She earned her Doctor of Dental Medicine from Midwestern University and her Master of Public Health from the University of Southern California. In more than 15 years of practice she has completed over 1,000 implant procedures and focuses on full-mouth restoration, complex cases and prevention-first care.
References
- American Association of Endodontists. AAE Consensus Conference Recommended Diagnostic Terminology.
- American Dental Association, MouthHealthy. Composite Fillings.
- American Dental Association. New ADA guideline recommends NSAIDs to manage dental pain in adults, adolescents. 2024.
- S. Food and Drug Administration. Dental Amalgam Fillings.
This article is for general education and is not a substitute for an examination. If you have symptoms, please contact a dentist.