Welcome to Neuro Talk. Bryanna is the best on the site for information regarding dental issues. She is tops and will reaffirm what I will say. A RC on a tooth is a temporary fix to a problem that may persist. The tiny canals inside the tooth can never be totally cleaned out with a root canal. It is a high dollar fix, that doesn't last. The infection is still there, and most likely is the cause of your continuted pain and problems. I had my RC teeth removed, end of problem, end of the money pit. NO, dentists often do not tell patients the truth. Then they want to re-treat the tooth, to the same effect. Yes, material can go below the root, and cause trouble too. If you feel they are hiding something from you, most likely they are. Your feelings are correct. I had persistant problems with two teeth that had a RC. I now have a nesbit, and am totally happy with it. This is a partial for the two spaces. I do not regret my choice for one minute. I trust Bryanna, as I also came to this site looking for some answers. She is the one who informed me of this situtaion with RC's. I do wish you all the best, and I hope you find another dentist or specialist who can help you once and for all remove the tooth and the infection. ginnie