Children with large gaps in their teeth may be due to physiological factors such as immature development, or disease factors such as periodontitis. 1. Physiological factors: children are in the period of physical development, so early when the teeth erupt relatively sparse, the amount of eruption of the teeth is small, so it appears that the gap between the teeth is relatively large, with the development of the body of the phenomenon can gradually improve. Secondly, in the process of tooth replacement, because of the teeth arrangement, the distribution of lip and cheek ties and other factors may also appear gap phenomenon. 2. Pathological factors: periodontitis is a chronic inflammation caused by microbial infection in dental plaque, which can cause red and swollen gums, gum recession, root exposure and other symptoms. As the disease continues to progress, it can eventually lead to loosening of the teeth, larger gaps and even tooth loss. Children with large gaps between their teeth can go to the hospital to get targeted treatment after clarifying the cause of the disease.