A child’s milk teeth usually erupt around 6 months of age, and at the age of 6 to 7 years old, the milk teeth gradually fall out and the permanent teeth will gradually erupt. Milk teeth are the first set of teeth that erupt in a human being, and they usually come out when the child is 6 months old, with a total of 20 teeth, 10 in each upper and lower jaw. Nowadays, due to the improvement of nutritional level, the time of teething will be advanced, and some children can start teething at the age of 4 months, which is also a normal situation. As the child grows older, the milk teeth will gradually fall out at the age of 6~7, and the milk teeth will be replaced by permanent teeth, which are the second set of teeth after the milk teeth fall out. After a child’s teeth are replaced, parents should allow their children to develop good hygiene habits, brush their teeth diligently, and keep their mouths clean to avoid tooth loss due to diseases or accidents. Children usually get their milk teeth when they are 6 months old, but due to individual differences, it is not possible to generalize the time of eruption of milk teeth.