Radiation to lower jaw caused bottom teeth to die, break off and generally look terrible. 20 hyperbaric oxygen treatments were ordered. I am now two days post-op for extraction of dead teeth and replacement with implants. ENT/DDS who did the work was very, very pleased because he said the radiated bone bled just as much as one that had not been subjected to rad. Just to be safe, tomorrow I begin 10 more dives. When I began all this I wanted to know how it was determined that hyperbaric O2 caused regrowth of capillaries. Seemed like a leap of faith to me, but by golly, it works! If I can answer questions for anyone, please ask.