If the child’s teeth are lost, the following reasons need to be considered: 1, if the child’s teeth are permanent teeth, permanent teeth will not be followed by teeth, this situation needs to take orthodontic or restorative treatment after the child becomes an adult. 2, if the lost teeth are milk teeth, but, after the loss of new teeth, if the time is more than a year, you need to take the child to Hospital for examination and surface tomography to see if there is congenital loss of permanent teeth. If it is within one year, there is no need to worry, as most of the baby teeth will erupt slowly within one year of loss.