Tracy,
Welcome... you've gotten some good advice already, but I want to emphasize something Glenn said. You need to see an dental oncologist. In some states, they don't use that exact term, but the idea is to find a dentist with a specialty in treating oral cancer patients. The folks you talked to might be fine dentists, but you need someone who does this full time.
I had radiation, and I still have my teeth... other than the ones I lost when they removed the right side of my mandible.
Good luck, my friend.
Ken