It is normal for children to lose their teeth between the ages of 6 and 12. Usually children start to erupt their milk teeth at 4-10 months of age, and their first permanent teeth erupt around 6 years old, and then the permanent teeth gradually replace the milk teeth and the phenomenon of tooth loss occurs. The timing of tooth loss is related to genetics, the child’s own or diet, so there are certain individual differences, some children will be earlier, some children will be later, this is a normal phenomenon, do not worry too much. There may be slight discomfort, such as pain, redness and swelling, when losing teeth. When the child loses teeth, parents should strengthen the child’s absorption of calcium, intake of calcium-rich foods such as milk, soy products, etc., and vitamin D-rich foods such as fish oil, animal liver, etc., to help the growth of teeth. The process of losing teeth should correct the child’s bad habits such as licking teeth and biting fingers to prevent situations such as misalignment of teeth, which affects the development of teeth while affecting the aesthetics. It is also necessary to pay attention to dental cleaning to avoid bacterial growth causing dental caries and plaque, which will affect the child’s dental development. If the child is more than 12 years old and has not lost teeth, it may be due to rickets, underactive thyroid gland or gum fibroids, etc. In this case, it is necessary to take the child to the hospital to identify the cause and carry out treatment.