Russ, I had the same radiation treatment they are planning on you, twice a day for 6 weeks, etc, to the left side of tongue as well as neck. My teeth themselves are in good shape, but do have a history of peridontal desease...Scaling and root planning are routine every 6 monts.
However, at the outset, there was never brought up a need to pull teeth for the treatment, I asked about it, but both the dentist and radiation oncologist said no, keep the teeth.
Guess every case is different, but I don't think having all your teeth pulled, especially with IMRT is a necessity these days. Depends on the condition of the teeth and jaw bone to start with.