Cracked teeth include tiny cracks in the teeth and severe longitudinal cracks in the teeth. Because dental tissues are non-renewable, they are generally not self-healing. 1. A cryptic fracture is a tiny crack that occurs on the surface of the crown of a tooth and is not easily detected. Cracks can be caused by internal factors of tooth structure and external factors such as excessive chewing force. 2. Longitudinal fracture refers to the occurrence of longitudinal cracking of the tooth. Once present, it often requires complex treatment or even extraction. The affected tooth has varying degrees of occlusal pain and can have recurrent periodontal abscesses. Because tooth tissue is non-renewable, it is usually not self-healing. If a cracked tooth occurs, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment under the guidance of the doctor.