Angel

Find a way to have those "teeth that should be removed" REMOVED prior to radiation. If money is a problem for you now, it will ONLY BE WORSE and MORE EXPENSIVE later. To answer your question, it is possible but not a good idea. HBO treatment is very expensive and even regular insurance fights you about it. I took good care of my teeth, had not had a cavity in twenty years, and passed a through review by a dentist who specializes in oral cancer patients (1 out of only two recommended in the handouts from Lombardi CCC) prior to radiation. I had regular and panoramic X rays taken as an extra precaution yet the radiation fried the nerves and jaw on my left side in order to get the cancer that had spread to those lymph nodes. Despite all precautions, so far I have had to have 3 root canals, 3 crowns and am currently hoping that this last root canal on an old wisdom tooth that otherwise would have been extracted because it suddenly cracked works out. At least the fluoride trays and teeth cleaning are working as I still remain cavity free. If that can happen to "good" teeth, then you do NOT want to find out what happens to "bad" teeth. Just google "Osteoradionecrosis" to see why this is so urgent.
Good luck and best wishes