Thanks. I plan to ask specifically about the targeted radiation tomorrow, because no, it was not really explained to me (in lay terms). My teeth aren't the problem, because I've been a denture wearer for 16 years (can't wear them now, however). Ironically, I initially thought the sore on my tongue was caused by denture friction, which I'd had before but it eventually went away just like a kanker sore does. So of course I invested $900 in a new set of lowers, which were worn down and not creating a good fit with the uppers. Then this happened. Murphy's Law. I think I wore the new ones twice, so when cancer treatment is finished, I will need to go back and have my dentures refitted.