I had both an exposed jaw bone and Osteoradio Necrosis (ORN) at the primary site of my cancer.

If the bone is just exposed and there isn't a sign of ORN then it's what Brian said, the site can be a constant infection risk until it's healed and HBO (hyperbaric tx) will help that heal. I've also been told that a skin graft can be used to help the issue if it's just exposed.

If there is ORN and it can't be solved by HBO then I believe surgery is the only option.

HBO is easy...the hardest part of it is fighting boredom...I can only sit and watch tv or movies for so long. I was lucky and had a great team that kept good conversation on hand.