Baby teeth change new teeth out of the old teeth can not come down, generally refers to the permanent teeth out of the milk teeth have not fallen out of the situation, need to consult a doctor in a timely manner, according to the specific circumstances of the choice to continue to wait for or extraction of milk teeth. Tooth replacement is a natural process, with the permanent teeth gradually grow, the roots of the milk teeth will be physiological absorption, absorption to a certain extent will appear to fall off, if there is no timely fall off, parents can let the child to eat a little harder food, so that can be physically to promote the fall of the milk teeth, and then continue to grow the permanent teeth. If the child’s milk teeth have not been able to fall out on their own, thus blocking the development of permanent teeth, may cause the permanent teeth to shift, it will make the teeth untidy, and later on will leave food residues and other bacterial residues, which will damage the teeth, and at this time, you need to extract the milk teeth under the diagnosis and treatment of a dentist in a timely manner, so that the permanent teeth will continue to erupt. Whether the child needs to be extracted to listen to the advice of the dentist, not blindly operate on their own to avoid adverse consequences.