Three months after radiation in 2011, I had a tooth infection/abscess in the back wisdom tooth, which was to get extracted. My RO, MO and Orthopedic surgeon said I needed HBO first. I was to have 20 dives, have the tooth extracted, then do another 10. Due to being hospitalized next, possible recurrence, etc. I never had it extracted, and infection cleared with the 30 dives, and antibiotics. I had other issues to deal with, so I never had it done. Now, during my recent treatment, I developed an ulcer in the same area which required a visit the dental oncologist. He did not want to do anything during treatmrnt, so I have to go back, and discuss HBO and extraction. Good luck