Most patients notice sensitivity for a few days to two weeks. Deeper fillings can cause sensitivity for up to four weeks, but it should be improving steadily. If sensitivity is still strong or getting worse after two weeks, call your dentist.

Yes. A filling that's sitting too high (a "high bite"), a filling placed too close to the nerve, or a filling with a small gap allowing bacteria back in can all cause pain. The good news is that most of these issues are quickly fixable once your dentist takes a look.

The filling material itself sets within minutes of placement. The tooth and nerve, however, need one to two weeks (sometimes longer for deep fillings) to fully calm down. By the end of that window, the filled tooth should feel just like the rest of your teeth.

Over-the-counter ibuprofen or acetaminophen is the most effective short-term option. Beyond that, switch to a sensitive-teeth toothpaste, avoid hot, cold, and sugary triggers, and chew on the other side of your mouth for a few days. If nerve pain is severe or doesn't improve, call your dentist — sometimes a deep filling needs additional treatment.

Signs that a filling may have failed include pain that gets worse over time instead of better, sharp pain when biting down that doesn't fade, visible cracks or chips in the filling, the filling feeling loose, sensitivity to sweets that lingers, or any sign of decay (dark spots) around the edges. A dentist can confirm with an exam and x-ray.

Mild nerve irritation typically resolves within one to two weeks. More significant irritation from a deep filling can take three to four weeks. If nerve pain is severe, throbbing, or still strong after a month, the nerve may be damaged and you should see your dentist to discuss next steps — which may include a root canal to save the tooth.

Usually no. Mild sensitivity in the days and weeks after a filling is normal and expected, not a sign of failure. Sensitivity that's getting worse, lasting beyond a few weeks, or accompanied by swelling or fever is a different story — that's when you should call your dentist.

Do wait until the numbing wears off before eating (to avoid biting your cheek or tongue), use a soft toothbrush, take over-the-counter pain relief if needed, and use sensitive-teeth toothpaste. Don't chew hard or sticky foods on the filled tooth for the first day, drink very hot or cold liquids for a few days, use whitening products until the tooth has fully settled, or ignore worsening pain.

There's no widely recognized "3-3-3 rule" in dentistry specifically — the phrase comes from anxiety-management contexts and isn't a standard dental guideline. For post-filling tooth pain, the more useful rule of thumb is that sensitivity should improve within 1–2 weeks (3–4 weeks for deep fillings). If pain is worsening, throbbing, or comes with swelling or fever, call your dentist instead of waiting it out.