A large tooth cracked after biting into the bone needs to be examined by radiographs if it causes longitudinal fracture of the root of the tooth needs to be extracted, and if the fracture reaches the pulpal cavity it needs to be treated with root canal therapy, and if it does not reach the pulpal cavity it can be restored with resin restorations and crown restorations. 1. Longitudinal root fracture. If the fracture site has caused longitudinal root fracture after radiographic examination, the tooth cannot be retained and needs to be extracted. 2. Fracture line reaches the pulp cavity. If the fracture line causes the crown to break and reaches the pulpal cavity, the pulp is infected by bacteria, and root canal treatment is needed to extract the pulp and then crown the tooth. 3. Fracture of the tooth does not reach the pulp cavity. If the fracture line only reaches the dentin, it is necessary to prepare a cavity, fill it with resin, and consider crown restoration according to the extent of the fracture to protect the tooth. When a large tooth cracks after biting into the bone, it is recommended to go to the hospital in time for examination and treatment to avoid deepening the fracture line.