There are two kinds of reasons for children’s sparse teeth gap, congenital and acquired, the former is congenitally missing teeth, acquired is periodontal disease, missing teeth, etc.. 1. congenital missing teeth: generally seen in permanent teeth, also known as congenital missing teeth, when the teeth are missing, there will be a wide gap between the sparse teeth, this can be orthodontic to improve. 2. Periodontal disease: periodontal disease is also a very important reason, long-term periodontal inflammation stimulation, so that the alveolar bone resorption, resulting in tooth loosening or even shifting of the teeth, can also lead to the above situation, can be periodontal scaling, scraping and other treatments. 3. Missing teeth: this is caused by the acquired, for example, due to trauma, caries, etc. caused by tooth loss or missing teeth, long time not repaired, will lead to displacement of the surrounding teeth, will also cause the appeal situation. There are other reasons for sparse teeth and large gaps in the teeth, so it is recommended to judge after examination in a regular dental hospital.