I had osteoradionecrosis of the left jaw after 35 weeks of radiation and 7 sessions of chemo for base of tongue cancer. It was very unusual to get this diagnosis so close to the end of treatment (only a few months). Usually you might see this years after treatment, but hopefully you won’t. I had 30 treatments at the Mayo’s multiplace chamber. I was scheduled for 40. There were usually four of us patients and one nurse. 90 minute sessions. Takes about 2 - 2.5 hours from start to finish. You get a thorough check before and after each treatment. It’s painless. In a multiplace chamber we each had our own oxygen hood. Comfortable chairs. Plenty of blankets. Worst part (being sarcastic), we had to decide what channel to watch on the tv. The treatments worked great for me, which is why I didn’t need the last 10 treatments. The staff was AMAZING!! It’s incredible what the body can do when it has the right treatments to heal the wounds that need a boost. Many doctors never think about HBOT for wound healing. Be sure you talk about it. It offered me such a better outlook on life and quality of life.