Hello Barbara. I completed 60 HBO treatments on 1/20/2011 for osteoradionecrosis of my right lower jaw. The treatment was very successful according to my Oral Surgeon who is also an MD. I had a pan X-ray on 3/7 and my mouth looks great ~ no holes, no "moth-eaten" bone. ORN does have to be watched carefully as Dr. E described it as a "smoldering burn." A side effect for me was deterioration in my distance vision, but I have a lens prescription that allows me to drive during the day. I am hopeful that my vision will improve to baseline prior to the HBO, but I know there is no guarantee. The cost for my HBO was $2280 per dive and this was covered by insurance since I had met deductible and out of pocket. Physician charges were billed separately. Yes, the treatment is time consuming, but I am very glad that I made the investment. All the best to you and Michael.