Cancer of the tonsil 2007. Today I was told that I could be facing a potential extraction of a top wisdom tooth on the side where I had radiotherapy because I have a cavity, which they have tried filling, but it has not been successful. Sutton Marsden previously advised I would need to have any extractions done under special conditions. Does anybody know any way of avoiding this? There's no disease at the present. I saw something about Colgate Stop Gel in another post. Has anybody had any experience of it.