A cracked tooth cannot heal itself, because unlike a fractured bone, a tooth is not reset and grows back over time. The bone can grow back, but the tooth, as a special hard tissue, has no way to grow back on its own in the event of a splintered or chipped tooth. In most cases, a split tooth will need to be extracted if it has already split to the root, but if it has only split part of the crown, check to see if the pulp has been exposed. If the pulp is not exposed, you can consider applying a bonding method to bond the split tooth to the remaining tooth tissue. However, care should be taken to ensure that this area is not subjected to large biting forces. However, if the fractured portion of the tooth has entered the pulp, root canal treatment is usually required before crown restoration can be applied to protect the tooth.