Craze lines are small cracks that only affect the outer enamel of the teeth. These fractures typically do not require treatment.
Cracked teeth occur when the tooth cracks from the chewing surface to the root, but is not yet split in half. If the crack reaches the pulp (area of the tooth made of living tissue), the tooth can typically be fixed with a root canal.
Split teeth occur when cracked teeth are left untreated. When teeth are split in half, the whole tooth cannot be saved, but sometimes a portion of the tooth may be saved with a root canal.
Fractured cusps happen when a piece of the chewing surface of the tooth chips off. Fractured cusps are not typically painful and can usually be fixed with a filling or crown.
Vertical root fractures are cracks that start at the root of the tooth instead of the chewing surface. These types of fractures are typically treated by removing the entire tooth. Sometimes the tooth can be saved through endodontic surgery.