It is a common clinical phenomenon that children still do not lose their teeth at the age of 7. For developmental reasons, some children lose their teeth early and some children lose their teeth late, which is a physiological problem in itself, so there is no need to worry about it. There is no good clinical intervention for this early and late development. Another reason is that the food that children eat nowadays is getting softer and softer, and the relative teeth and gums are not effectively stimulated, so the situation of late tooth replacement will occur. Therefore, for this situation, you can ask your child to eat more coarse fiber food, try to make the periodontal tissues of the teeth to be physically stimulated, so that the replacement of teeth can be more rapid development.