well here is a great update. I did at first see an oral surgeon. He said no problem. I asked if he wanted to speak to my RO or my Dental Oncologist. He declined, said I need the HBOT and we will be fine....he gave me the willies.
So I did see my dental oncologist. He said tat the area where the tooth is was not in the radiation field. No need for HBOT. He also gave me the name of some oral surgeons who work with my ENT and RO.

So it will be a bit more simple that I thought, certainly a better path.

Thanks to every one for the advise