How often should children’s dental checkups be performed once every three months for preschoolers and once every three months to six months for school-age children. This is because children’s milk teeth are more prone to decay, which is determined by its anatomical and tissue structure characteristics. The tissue structure of children determines that children’s milk teeth are more prone to plaque deposition and decay. Moreover, the thin mineralization of milk teeth and the weak acid resistance are also the reasons for the caries. In addition, children’s self-control ability is poor, and their ability to brush their own teeth is weak, and the self-cleaning and cleaning effect of teeth is also poor, which are the reasons that cause the decay of milk teeth. Once the decay of milk teeth occurs, the development is fast and it is easy to cause serious harm to children, including both local and systemic harm. Therefore, we must make the habit of going to the hospital for oral examination regularly, and the doctor will talk about the oral hygiene knowledge for parents during the examination. During the examination, the doctor will talk about the oral hygiene knowledge for parents, guide the child’s brushing and usual eating habits, and in the process of examination, problems that are not easily found can be found, so that early examination, early diagnosis and early treatment can be achieved.