People who've had root canals...

Originally Posted by tooge

It is most likely referred pain from a nearby tooth. Or, it could be that when the original root canal was done, a canal was missed. This second option is unlikely, particularly if it was done by an endodontist. Anyhow, go see your dentist. They will take an x ray and figure it out for you.

There's the dentist I probably would have recommended.