31 years, congratulations! That radiation really does the damage. I’m on a head/neck cancer forum and some folks end up on permanent feeding tubes or lose ability to speak.
So, before he would remove the tooth, I had to be in a hyperbaric chamber for 40 hours, 2 hours at a time as the forced 100 percent oxygen actually grows new blood vessels. Underwent that, had the tooth removed (the surgeon was happy to see good blood flow) and another 10 hours afterward to speed healing. Luckily, I haven't had to do anything else like that. The new blood vessel growth is considered permanent. Had the treatment at Mt. Vernon hospital in No. Virginia.