If the milk teeth fall out of the new teeth late not more than 6 months, is a normal phenomenon. If it is more than 6 months, it is abnormal and parents should pay attention to it. Most children will erupt their permanent teeth about 3 to 6 months after the loss of milk teeth. Therefore, the eruption of permanent teeth within 6 months after the loss of milk teeth is normal and parents do not need to worry too much. If the permanent teeth have not erupted after 6 months, parents should be alert to calcium deficiency, localized gum disease, improper feeding and other factors, all of which are abnormal phenomena and need to be taken seriously. During the period when the child’s milk teeth are falling out, it is necessary to develop good oral hygiene habits, rinse the mouth in time after meals to prevent infections from occurring. Parents should also supplement the child’s nutrients, such as milk, eggs, etc., to avoid too fine a diet, appropriate chewing will help the eruption of permanent teeth. If the problem is caused by gum disease, treatment should be prescribed by a doctor. Parents are advised to take their children who have lost their milk teeth to the doctor for a checkup so that the specific situation can be clarified and appropriate treatment measures can be taken.