There was a pustule at the gum in my lower right first molar for years, which caused the tooth's surrounded jaw bone melted. My current dentist had performed endodontic treatment last year. And I was told if the treatment is successful, the jaw bone will recover over time, but periodic follow up is needed. Before that 2 times of Endodontic treatments were performed at the same tooth in the past decade. According to my dentist, there wasn't any crack in the tooth while he was doing the treatment with the microscope. However, after a year past of the very last treatment I still feel so uncomfortable with my tooth. Recently there was pustule formed again. Blood and pus came out after breaking it. My dentist told me that possibly there is a crack at the outside part of the tooth by looking at the X-ray (there is shadow around the tooth). However he will need to cut open my gum skin to confirm where the crack is and how the crack is like for further treatment. One of his suggested treatments is cut half of the tooth (the side that has a crack), keep the other half, and then put a bridge over there. Another suggestion is move my wisdow tooth to replace this broken tooth. I am just wondering do both of these suggestions really work? Another of my concern is can melted jaw bone really recover overtime?