Children’s tooth decay if not treated in time will affect the future replacement of teeth, resulting in the possibility of causing malocclusion or permanent teeth underdevelopment, the emergence of tooth decay needs to be dealt with in a timely manner to the hospital. 1. Malocclusion. If children do not get timely treatment for tooth decay, due to dental defects, it may cause elongation of the opposite jaw teeth or tooth decay leading to congenital loss of teeth, disordered tooth arrangement, and insufficient space for the eruption of permanent teeth, which will lead to malocclusion. 2. Inadequate development of permanent teeth. Tooth decay can cause pulpitis periapical inflammation, inflammation reaches below the root tip may affect the development of permanent tooth germs, causing enamel underdevelopment and streaks or yellow spots on the tooth surface. Children’s tooth decay will affect the future replacement of teeth, it is recommended to go to the hospital in a timely manner to fill the post-decay, to limit the continued development of caries.