I had a root canal Dec 2008. Continue to have some tooth pain. Root Canal done by Endontist. Been back 4-5 times for checks on why. Referred to Oral Surgeon, Neurologist. Usually comes and goes, but has been here for 3 weeks, seems to be getting worse. After eating, always seems to feel like something got between the tooth. No tooth pain when chewing, but can throb in the gums and back into the ear after eating. Neurologist said it could be trigeminal nerve, but darn it to me as it sure does feel like the tooth. X-rays by Endo this week said the tooth looked ok. so what causes the pain. Vertical fracture? how to diagnose?