I had root canal therapy 5 months ago, but had incredible swelling afterwards, like a golf ball.  Obviously, I went back to have it checked and they found out, after X-ray, that the back molar had a huge crack and infection in gum.  Antibiotics, and Panadeine Forte, then extraction.  However, since then, Im going insane, as my bite is all wrong, and teeth are constantly encrouching on my teeth, and seems the temporary crown is too large.  Anyway, Im at the point that I want to try and file back the tooth myself, as have been back to dentist, and although they said they could see what was wrong and would fix it, its worse and driving me nuts and preventing sleep.
Hello, Thanks for writing to us. Usually after root canal treatment swelling will not arise if the treatment had done successfully. In your case, tooth may have cracked, re-infected or perforated which can lead into swelling. An x-ray of the tooth will help to diagnose the infection underlying. Tooth has to be either extracted or root canal procedure has to be repeated if necessary. Complete course of medicines has to be administered. Take care.