Hi, I received root canal treatment back in february, the filling is quite deep. Anyway there is a crack at the side of it, this happend about a month ago and its only now that it is becoming sensitive/mildly painful whilst eating. When I go back to the dentist will they take the filling out and put a new one in or can they ammend the one thats cracked/broken. (i've been back and forth about 8 times concerning the filling in the tooth, really don't want a re-run)