I had root canal in upper left side second last molar which do not have pain but was previously filled. Docter has suggested me for RCT and Crowning becase the filling is pulled out and a side of molar is broken. 1) after first sitting everything is good. 2) but the day after second sitting i had sufferd from sinus drainage several times a day and the color of thay substance was brown and also had pain in molar. after that doctor has removed the temporary filling. 3) after third sitting he again filled temporary filling and ask me to see if i again suffer from sinus liquid or not. but i am feeling a throbbing pain. can anybody tell is it everythy normal in my case