Recently, shortly after the start of an elementary school, there were first graders taking time off every day to have their teeth pulled. This made the class teacher wonder what was wrong with the child’s teeth. Generally speaking, children’s permanent teeth are replaced only after their baby teeth fall out. However, many children today have permanent teeth, but the baby teeth are “stuck” and refuse to fall out, so they have to turn to the dentist to have them pulled. This is medically known as “retained milk teeth”, where the new permanent teeth, because the normal growth space is occupied by the milk teeth, will burrow out from the place above the dental bed, thus forming an ugly mouthful of horizontal and oblique teeth. This is inextricably linked to the over-refined diet and feeding of children nowadays. “Many parents are afraid that their children will not digest, so they feed their children food that is chopped and stewed, eat ribs with the bones picked, eat apples peeled and cut into small pieces, eat crabs with the meat shell peeled off, too refined feeding methods make the jaw bone lack of normal chewing stimulation and lead to degeneration or underdevelopment, resulting in permanent teeth erupting ectopically instead of at the root end where the milk teeth should have been replaced The result is that the roots of the baby teeth are not fully resorbed.” “The new permanent teeth lack sufficient strength to top off the baby teeth and erupt from wherever there is a gap in the tooth bed, resulting in a mouthful of crooked teeth that need to be corrected.” It is recommended that parents of children who have not yet changed their teeth should let their children eat more coarse grains such as corn, nibble on harder fruits such as apples and nuts such as pecans to strengthen the exercise of the milk teeth and promote the normal development of the jawbone and the natural loss of milk teeth. At the same time, in addition to maintaining a clean mouth and good dental habits, correcting bad habits such as picking teeth with toothpicks, biting the tip of a pen, allowing fingers and spitting out the tongue, it is recommended that children should regularly (at least once a semester) go to a hospital stomatology department or professional dental clinic for a checkup after entering the age of tooth replacement, and if permanent teeth are found to have grown out, the remaining baby teeth should be extracted in time to prevent the permanent teeth from growing out of shape.