Cracked incisors can be caused by trauma, but also bite trauma. 1. Trauma: If you don’t do a good job of dental care and health care, the impact of the teeth by external forces may lead to damage to the dental tissues, but also produce the symptoms of cracked incisors. 2. Occlusal trauma: patients with cracked incisors may also be related to occlusal trauma, if the bite process if excessive force may lead to tooth enamel damage, there may also be cracks in the dentin. If there are cracked incisors, it is recommended to actively seek medical examination and treatment. It is best not to brush your teeth too hard or eat too much hard food, and to take good care of your teeth.