Widening of the gap between teeth may be caused by congenital factors, it may also be caused by food impaction, or it may be related to periodontal diseases. 1. Congenital factors: If the teeth are small due to congenital factors, widening of the gap will occur with age. In addition, with age, the gums will also gradually shrink, which in turn leads to wider gaps. 2. Food impaction: For people who have food impaction in their teeth for a long time, they are also prone to the phenomenon of widening of the gap between their teeth. 3. Periodontal disease: If there is gingivitis, periodontitis and other periodontal diseases, due to long-term inflammation stimulation, the gums may shrink, which will lead to widening of the gap between the teeth. It is recommended that patients pay attention to oral hygiene, if discomfort occurs, should actively seek medical treatment.