I had two top front teeth root canals done in January. Five weeks ago I had the other two top teeth done. Off and on from Jan to Aug, I felt pain in one of the teeth done in Jan. Now, I am still feeling the same kind of pain I had before the two were done in August. It is not a bad pain, more of an annoying ache, sometimes a bit sharper similar to the pain experienced when something cold like ice cream hits your teeth. I have not been back yet since the ones done 5 weeks ago, I go next week, but my endodontist was already stymied by me in August. He says I can't be experiencing pain in teeth with no roots but yet I am. Do you know what this could possibly be? Let me add that in my early 30's I wore braces for almost 3 yrs to correct a bite problem. At that time, my orthodontist told me that sometimes braces in adults cause shorter roots, which I have seen on my xrays. Is this part of the problem? Can you offer any advice? Thanks so much.