Children should be treated promptly once they have tooth decay. Do not think that the teeth in children’s mouths are all milk teeth that will be replaced by permanent teeth sooner or later, so it doesn’t matter whether they are treated or not, this is a very wrong view. Once tooth decay occurs and is not treated in time, it will soon lead to toothache symptoms. If a child has a toothache, it is necessary to check whether the tooth decay has damaged the nerve of the tooth. If the nerve is damaged, then root canal treatment is needed for the baby tooth to solve the toothache problem. For the tooth decay of the baby tooth, we must do early diagnosis and early treatment to control the decay of the baby tooth in the early stage, so that it will not develop and continue to destroy and lead to the occurrence of pulpitis and periapical inflammation. If the tooth decay of children is not treated in time, once periapical periodontitis occurs, it will affect the growth of permanent teeth. At this time, the permanent teeth will cause the permanent teeth enamel development insufficiency, which is an irreversible developmental disorder, and will have a negative impact on the child’s lifelong oral health, so we must pay attention to the protection of the baby teeth. The prevention of milk teeth caries is very important, we have to cultivate the good habit of brushing teeth from childhood, to brush teeth in the morning and evening. Rinse the mouth after meals, so that it is conducive to the oral health of children. Once a cavity is found, it should be treated in time, otherwise there will be toothache and even affect the development of permanent teeth.