Thanks for the reply. I finally saw my ENT again last week for a follow-up and he felt the sore on my tongue had sufficiently healed that a biopsy was not necessary. As he said, "cancers don't get better". He felt that the main cause was tooth irritation, and the lack of moisture in my mouth was causing an inability to heal quickly.
Regarding the chemo treatment, I am in a study that had two doses of cisplatin with an accelerated radiation plan. The second arm of the study included Erbitux, which I did not get on.
All is good at this point, but I will stay vigilant with the anti-oxidants, etc. to keep this cancer away.