The surface of the tooth does not usually appear to be cracked after orthodontic treatment. Considering that it may be caused by occlusal trauma, hidden cracks, etc., patients can be treated by tooth extraction and crown restoration. 1. Occlusal trauma: If there is an occlusal high point, patients should seek medical attention to adjust and grind the high point. After eliminating the occlusal discomfort, crown restoration can be done to restore the shape. If there is no improvement in the treatment, we can consider extracting the tooth and do implant restoration after treatment. 2. Cracked teeth: It may also be caused by cracked teeth, patients need to actively seek medical treatment, can do crown restoration to improve. It is recommended that patients with cracks on the surface of the teeth after orthodontic treatment should actively seek medical attention to identify the cause of the symptomatic treatment.