Cracked teeth require different treatments depending on their location and severity. Cracks that are just a few millimeters in size are common and rarely require any treatment. When a crack affects a tooth's cusp, however, a treatment procedure may be necessary - possibly a crown.   Many people have cracked teeth at some point in their lives. Several procedures can be used to save your tooth as well as your appearance.   Although a cracked tooth can be repaired, it will never be 100 percent healed, unlike a broken bone. It is best to seek treatment as soon as possible in order to save your tooth from infection and further damage. After the treatment, your mouth may be sore for a few days, but the pain should subside.