Mild tooth sensitivity for one to two weeks after a filling is normal as the nerve settles. Cold sensitivity and slight tenderness usually fade on their own. Sharp lingering pain, throbbing at night, or pain when biting that lasts beyond a few weeks means you should call your dentist for a bite check or evaluation.

You just had a cavity fixed. Now the tooth aches when you sip iced coffee, or twinges when you bite down on toast. That doesn't automatically mean something went wrong. At Fresh Smile Dental Care in Koreatown Dallas, we get this call almost every week, and the honest answer is: most post-filling discomfort is temporary. The trick is knowing the difference between a tooth that's calming down and one that needs a second look.

Is it normal for a tooth to hurt after a filling?

Yes. Short answer, but worth explaining. When we remove decay and place a filling, the tooth's nerve (the pulp) has just been through a small trauma. Drilling generates vibration, heat, and pressure close to the nerve. According to the ADA's MouthHealthy resource, mild sensitivity after a dental filling is common and typically resolves within a few weeks.

Here's what patients often describe in the first few days:

• A dull ache when the anesthetic wears off

• Brief zings with cold water or air

• Tenderness when chewing directly on that tooth

All of that fits the normal recovery pattern. The deeper the cavity was, the closer we had to work to the nerve, and the longer that quiet inflammation can linger. That's just biology.

Why is my tooth sensitive to cold or air after a filling?

Cold sensitivity is the most common complaint we hear, especially from patients who commute in from Addison or Carrollton and grab an iced drink on the way to work. There are two main reasons.

First, preparing a cavity briefly exposes microscopic channels in the dentin called tubules. These tubules connect the outer tooth to the nerve. Until the filling and the tooth fully settle together, temperature changes can travel down those channels faster than usual.

Second, composite resin (the tooth-colored filling material) shrinks very slightly as it hardens. Peer-reviewed research published in the Journal of the American Dental Association has documented that this polymerization shrinkage can produce short-term postoperative sensitivity, especially on larger fillings. It's technique-sensitive, meaning careful bonding minimizes it, but it doesn't always eliminate it.

The good news? This kind of sensitivity almost always fades within two to four weeks as the pulp calms and the bond stabilizes.

Why does my bite feel off or high after a filling?

This one deserves attention. If the tooth feels taller than the ones next to it, or if only that tooth hits first when you close your mouth, the filling is likely slightly overbuilt.

Here's why it happens. During the appointment, you're numb. It's very hard to check a bite accurately when half your face can't feel anything. We do our best with articulating paper, but tiny high spots can hide until the anesthetic wears off and you chew a real meal.

A high filling isn't just annoying. The ADA notes that a filling interfering with occlusion can cause biting pain and typically requires a quick occlusal adjustment. Every chew slams that one tooth into the opposing tooth with extra force, which inflames the ligament around the root.

Don't wait it out. A five-minute polish with a fine bur usually solves it completely.

A high filling isn't something to tough out. Call the office. Five minutes fixes weeks of misery.

When post-filling pain means something more serious

Most of the time, filling discomfort is a healing curve. Sometimes it's a warning. Here's what raises our concern at Fresh Smile Dental Care:

• Sharp pain to cold that lingers more than 30 seconds. The American Association of Endodontists identifies this as a classic sign of irreversible pulpitis, which may require root canal treatment.

• Spontaneous throbbing, especially at night or when lying down. When the nerve is inflamed enough that it hurts on its own, the pulp is often no longer able to recover.

• Pain that gets worse instead of better after two weeks. Recovery should trend downward, not upward.

• A sharp catch when releasing a bite. This can signal a crack in the tooth structure under an old filling or under new decay we couldn't see until we drilled.

Any of these deserves a call, not another week of ibuprofen. A tooth with a cracked cusp or a dying nerve doesn't heal on its own. Catching it early often means the difference between a crown and a root canal, or between saving the tooth and losing it.

What to do while your tooth settles

If your symptoms sound like normal healing (mild, fading, no throbbing), a few simple steps help:

• Chew on the other side for a few days. Give the ligament a break.

• Skip the extremes. Ice water, hot soup, very sweet or very acidic drinks all provoke a fresh filling.

• Try a desensitizing toothpaste with potassium nitrate. A Cochrane Review found these can meaningfully reduce dentinal hypersensitivity when used consistently.

• Use ibuprofen (if you can tolerate it) for the first day or two. It targets inflammation, not just pain.

• Track the trend. Better each day is a good sign. Worse each day is a phone call.

A patient in her 40s came in to our Royal Lane office last spring after a filling done elsewhere. She works in the Asian Trade District and had assumed the ache would settle. Three weeks in, cold water was making her wince for a full minute. A short exam and a bite adjustment (plus one refined margin) resolved it in a single visit. She didn't need a root canal. She just needed someone to check it.

That's usually how it goes. Most post-filling problems are small fixes when caught early.

Frequently Asked Questions

How long should a tooth hurt after a filling?

Mild sensitivity typically lasts a few days to two weeks. Larger or deeper fillings can take up to a month to fully settle. If discomfort is still significant after two to four weeks, or if it worsens at any point, it's time to have the tooth evaluated.

Can a filling be too high and cause pain?

Yes, and it's one of the most common causes of persistent biting pain after a filling. Because you're numb during the appointment, small high spots can hide until you eat a real meal. A quick occlusal adjustment usually fixes it in one short visit with no drilling into the filling itself.

Does pain after a filling mean I need a root canal?

Not usually. The majority of post-filling discomfort is inflammation that resolves on its own. However, lingering cold sensitivity beyond 30 seconds, spontaneous throbbing, or pain that keeps you up at night can signal irreversible pulpitis, which may require root canal treatment to save the tooth.

Why does my new filling hurt only when I bite down?

The two most likely reasons are a slightly high filling or a small crack in the tooth. A high filling is easy to adjust. A cracked tooth needs an exam and often a crown to protect it. Either way, biting pain that doesn't fade in a few days should be checked.

Should I go back to the dentist for post-filling pain?

Call if the pain is worsening, lingering more than 30 seconds after cold, throbbing on its own, or if your bite feels off. Don't wait for it to get worse. Most issues are quick to resolve when caught early, and a bite check is almost always a five-minute appointment.

If you're in Northwest Dallas, Koreatown, Farmers Branch, or anywhere along the Royal Lane corridor (we're two blocks from the DART Green Line Royal Lane Station), we're happy to take a look. Call Fresh Smile Dental Care at (214) 623-0880 and we'll get you in for a bite check or evaluation, often the same week.