Children’s teeth do not fall out mainly due to the replacement time, congenital absence of permanent teeth or retained milk teeth, which should be regularly observed or treated with tooth extraction. 1. The eruption time of children’s teeth has a certain pattern, if the teeth have not yet reached the replacement time, then the teeth will not fall out; generally there is no need for special treatment, to be replaced normally. It is recommended to eat a moderate amount of hard food to promote the eruption of teeth. 2. If the teeth to be replaced by children are congenitally missing, the teeth will not fall out normally; regular observation can be made, such as milk teeth without obvious symptoms of looseness, pain and other symptoms can be used normally when no special treatment is needed, on the contrary, it will be extracted and then carry out the restorative treatment of missing teeth. 3. If children’s teeth are not falling out and new teeth are erupting, that is, the symptoms of retained milk teeth; we must consult a doctor in time to remove the milk teeth in order to promote the normal eruption of permanent teeth. It is recommended to consult a doctor for a clear diagnosis and treatment in order to avoid delaying the condition.