Large gaps between children’s teeth may be caused by physiological factors or due to diseases such as periodontitis and large labial bands. 1. Physiological factors: because the child is in the stage of milk teeth, due to the small form of milk teeth, there is a growth gap, the children’s teeth gap situation. 2. Pathological factors (1) Periodontitis: due to poor oral hygiene habits, the oral environment inflammation, stimulate the alveolar bone, resulting in gingival recession, tooth loosening, etc., caused by the gap between the teeth will become larger. (2) Thick labial tie: due to the low adhesion between the teeth bed and the door, causing the gap between the teeth can not be closed, the gap between the teeth will become wider, or lead to the root of the tooth is exposed, the tooth is shifted, and so on. Children with large gaps between teeth may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.