Has anybody out there experience a connection with root canels and oral cancer occurance? I had a so called sinus infection and a root canal that kept giving me problems for years. The tooth was re-rooted at least twice and then just "unpacked" and left empty. This was fine and I had no pain until a new dentist re-rooted/repacked the tooth ... major pain came back. The tooth was removed just prior to the cancer diagnosis. Haven't had any sinus inffections since. Just oral cancer!...unknown.