hi melissa and amber,
i can't answer any of your questions.
however my wife and i have a very good friend from our high school days. she had thyroid cancer and did radiation treatment for it some 40 yrs ago. we saw her again a few months ago. she's had a full life with kids and grand-kids. no oral cancer developed.
hopefully treatments have progressed enough that all will be fine for you.
best wishes.
cu,
larryb