Cavitations

Sometimes, after a tooth has been removed, the bone in the area doesn’t heal properly and some of it may die. This is called cavitational osteonecrosis. This dark, acidic, oxygen-deprived environment is a perfect breeding ground for microbes. The jawbone becomes inflamed, infected and unhealthy.

Resources: https://onlinelibrary.wiley.com/doi/10.1111/j.1600-0714.1999.tb02115.x