Children’s milk teeth will be gradually replaced by permanent teeth. There are two sets of teeth in a person’s life, respectively, milk teeth and permanent teeth, milk teeth have a total of 20, basically 20 milk teeth will fall out during the tooth replacement period, all replaced by permanent teeth, the time of tooth replacement is about from 5 to 7 years old, the end of the time is about 11 to 13 years old, each child’s body is different, so the time of tooth replacement is not the same. Parents must pay attention to the child’s oral hygiene during the tooth replacement process, keep the mouth clean, urge children to brush their teeth, if you do not pay attention to good oral care work, may lead to the development of the teeth are affected, and may even have oral diseases. If there is a delay in the replacement of milk teeth, it is recommended to go to the regular hospital stomatology department in a timely manner, by the professional doctor for examination and give targeted advice.