It is recommended to go to the dentist to ask the doctor to extract the milk teeth, or you can chew some hard food properly or gently shake it until it falls out. 1. If the permanent teeth have grown out, but the milk teeth still have not fallen out, this situation is called retained milk teeth, which need to be extracted in time to avoid uneven teeth. However, when pulling out the teeth, you must go to a professional dental hospital and ask a professional doctor to operate. 2. If the milk teeth do not fall out during the tooth replacement period, you can eat some hard foods, such as nuts, to promote the fall of milk teeth. 3. You can also try to gently shake the milk teeth that are about to fall out, as long as the roots are completely detached, gently rotate them and they will fall out. However, do not force the tooth to pull hard, otherwise it may damage the gums and cause infection. If the baby teeth do not fall out for a long time, you should take the child to the hospital as soon as possible to remove the remaining baby teeth and make room for the permanent teeth to erupt.