I have tooth pain 3 mos. after cavity filling. dr. examined it, saw nothing wrong, but pain persists. seems to travel since i can't tell which tooth is?

Something is amiss: If the pain started right after a tooth was restored, then there is a really strong chance that it is that tooth. It can also be a different one, but your denist needs to isolate the tooth, since this can't be diagnosed over the internet. An endodontist in your area may be able to help you if your dentist can't.

RCT?: Dr. Davantzis gave you a great answer. What you are feeling is not uncommon. Sometimes it takes the nerve in a tooth to act up, and this can come and go. It sounds like you may well need root canal therapy on that tooth, although it could be another tooth or multiple problems. It could even be bruxism. Consider seeing another dentist or an endodontist if your dentist can't solve the problem.

See an endodontist: I would suggest for you to seek an endodontic evaluation by an endodontist (root canal specialist). The endodontist would be able to evaluate the tooth properly and inform you of the cause of discomfort and recommend the treatment of choice.

See your dentist: A tooth pain won't go away without treatment and the infection may spread to your jaw, cheeks, sinus and to other areas of your head and neck. You can use Tylenol (acetaminophen) for pain control. See a dentist ASAP for assessment and treatment.

Second opinion: If the dentist tells you nothing is wrong with the tooth, seek another opinion - from an endodontist.