A cracked tooth usually doesn’t heal on its own, and even when it is reset and held together, it doesn’t heal as well as it should. Many people think that if a broken bone can heal itself, so should a tooth, but this is not actually true. Teeth are not bones, although they are both made of calcium. Fractures generally heal because most bone is covered with periosteum, which contains osteoblasts that promote regeneration and healing of damaged bone. But teeth do not have periosteum on their surface, so they cannot repair themselves. In addition, bone has a bone marrow that produces red blood cells and white blood cells, which are supplied through an artery that connects the periosteum to the bone marrow to promote healing. On the other hand, the inside of the tooth only has pulp, and there are no red blood cells or white blood cells with regenerative function, so a cracked tooth cannot heal itself. It is recommended to go to the dentist in time, remove the more movable part, keep the inactive part, do root canal treatment to deal with the nerve, and then do porcelain crown restoration. If the crack goes deep under the gums, or the whole tooth is cracked into two movable halves, it may need to be extracted.