Sparse teeth in children can be seen in the late milk teeth and jaw and mixed dentition period, can also be seen in congenital missing teeth, specific need to go to the hospital for oral examination and x-ray examination. 1. Mastoid and late and mixed dentition period: children with sparse teeth, in the mastoid and late due to the growth of the jaw arch, there may be gaps in the teeth, in the mixed dentition period, due to the eruption of the teeth, the embryo of the tooth compression of neighboring roots may also cause sparse teeth alignment. 2. Congenital missing teeth: affected by genetic factors and physical development, there may be congenital missing teeth, resulting in sparse teeth, according to the situation requires orthodontic treatment, leaving space for teeth, and consider the later prosthetic restoration. Children with sparse teeth, the specific need to go to the hospital to confirm the examination.