Over the years I have seen more and more cases of osteonecrosis of the oral cavity. The osteonecrosis or bone death is caused by drugs given to prevent osteoporosis or given with chemotherapy drugs to treat certain cancers such as prostate cancer. The dead bone can lead to significant pain and infection. When you have areas of bone in your mouth exposed that will not heal you should seek medical evaluation.
If you are taking drugs used to prevent osteoporosis and are considering oral surgery procedures such as dental implants, discuss it with trained surgeons of the oral cavity.