A large tooth cracked in half from the center if the tooth can be retained, then dental restoration, if not, extraction treatment. 1. If the crown is cracked and the crack does not reach the pulp cavity, the tooth can still be retained. Food debris and other foreign objects can be removed from the crack and then cleaned. Dual-cured resin adhesive is used to bond the tooth tissue. Stainless steel wires are ligated proximally and distally from the crown to fix it, and a full crown is fabricated for restoration. 2. If the crown root is fractured and the tooth cannot be retained, extraction treatment is required. First, systemic diseases such as hypertension, diabetes and heart disease should be excluded. Women should avoid menstruation before tooth extraction. Don’t brush or rinse your teeth within 24 hours after extraction. Fixed denture can be repaired about 1 to 3 months after extraction, and fixed denture can be repaired more than 3 months later. It is recommended that patients go to the hospital stomatology department in time to deal with the standardized treatment under the guidance of the doctor, and usually pay attention to protect the teeth.