On Monday I had a root canal. There was some question about which tooth was infected but the endodontist assured me he was confident he fixed the right tooth. The tooth pain hasn't been bad and an occasional ibuprofen seems to deal with it. I'm a little anxious as I keep having referred pain in teeth that are nowhere near the bad tooth, but I know that can happen so I'm not too worried. My immediate problem is a mouth sore/canker that has cropped up. When the endodontist did the procedure he fastened a rubber/plastic shield to my lips and jaw. The place where it was fastened to my lip has developed a painful sore like a canker or cold sore. Usually canker sores heal pretty quickly for me but this one just sits there being sore. I know some people here have problems with mouth sores and I would appreciate some suggestions on methods of helping and healing mouth sores.