Sudden gap in adult incisors is considered to be the occurrence of trauma, but also may be related to various factors such as dental caries. 1. Trauma: If you are hit by an external force, it may lead to localized damage to the teeth, and thus the symptom of a sudden gap in the adult incisors may occur. 2. Dental caries: If dental caries occurs, food debris accumulates around the teeth, which may lead to corrosion around the teeth, and thus the symptom of gaps between the incisors may occur. If the gap is not serious generally do not have to treat, usually pay attention to personal hygiene, diligent brushing and rinsing can be. If the gap is more obvious, affecting the individual’s normal diet, it is recommended to consult a doctor in a timely manner for orthodontic repair or filling repair.