The baby’s milk teeth did not fall out of the new teeth and grow out, this situation is called milk teeth stagnation. If the milk teeth do not affect the eruption of permanent teeth, can be temporarily observed; if the retained milk teeth block the eruption of permanent teeth, parents should take the baby to the hospital as soon as possible for milk teeth extraction. Tooth replacement is a normal physiological phenomenon, with the gradual eruption of permanent teeth, the root of the milk teeth appear physiological absorption, absorption to a certain extent can fall off; at this time, you can calcium baby to eat a little hard food, which can promote the absorption of the root of the teeth and the development of the jawbone, the milk teeth can be directly dropped, and the permanent teeth can be correctly erupted. If the milk teeth are late for a long time, and block the eruption of permanent teeth, or lead to ectopic eruption of permanent teeth, resulting in malocclusion, parents should take the baby to the hospital as soon as possible, for milk teeth extraction, to make room for new teeth, so that the new teeth can grow better, to avoid affecting the new teeth. When a baby has milk teeth that have not fallen out and new teeth have grown in, it is recommended that he or she be seen in a timely manner to be evaluated and treated by a specialist.