A little over a year ago, I had a root canal and permanent crown on my #17 molar. There were no problems with the surgery or the crown placement, and a few days later everything was fine with no pain or discomfort present. But a couple of weeks ago, I noticed an odd sensitivity in that tooth. I do not have pain when I chew or wash cold water over it, but if I touch the tooth or swirl my tongue over it, I have a pain similar to when my endo was removing the temporary crown. I do not have any pain in my jaw. Since the nerve was removed, where is this sensitivity coming from? I should mention that my #18 molar was extracted about 5 years ago and never replaced, but I haven't had any problems with that situation either.