Usually, it is normal for children to lose and replace their teeth between the ages of 6 and 12. Generally, around the age of 6, children’s milk teeth will gradually loosen and fall out automatically after a certain period of time, and then gradually grow permanent teeth. There are a total of 20 baby teeth, until the child is about 12 years old, the baby teeth will all fall out, erupting permanent teeth, children’s permanent teeth have a total of 28. If children change their teeth too early, it may be due to gingivitis, periodontitis, lack of nutrition, etc. If children change their teeth too late, it may be due to congenital missing permanent teeth, blocked teeth, etc. If children change their teeth too late, it may be due to congenital missing permanent teeth, blocked teeth, etc. If the above abnormalities occur, you should go to the stomatology department of the hospital in time to do a detailed examination to clarify the diagnosis and treat the symptoms. In addition, parents need to pay attention to the need for children to clean well during the period of tooth replacement, and instruct children not to use their hands or tongues to fiddle with the new teeth, and not to allow them to eat too many desserts and carbonated drinks during this period.