I am 2 years past radiation to my right tonsil area. My oral surgeon had me do the HBO dives 20 prior to extraction, then 10 more after, as a preventive for ORN. There is a local facility that allows private pay, which was cheaper for me than going through my insurance which did approve it. I paid $4500 for these 30 dives. Oral surgeon also is having me to do the PENTO protocol Pentoxyphyline 400 mg and Vitamin E 1000 mg ( you can find vitamin E in 400 and 200 mg in smaller capsules than the 1000mg for ease in swallowing ) I will do this for 6 weeks post extraction. Had my 2 week check up and he said everything is healing great. His take is we will do everything we can as a preventive measure. He also added GEM 21 with the bone graft material at time of extraction, I believe this is to aid in healing and aid the bone graft. Then in 9 months if all is well will move forward with implants.