The normal loss of front incisors in children will result in the eruption of permanent teeth in about 3 to 6 months if they are milk teeth, which varies from person to person. If they are permanent teeth, no new teeth will come in. Children begin to change their teeth around the age of 6, and by the age of 12, all of their milk teeth will be replaced by permanent teeth, which is called the period of tooth replacement. When children’s milk teeth fall out normally, permanent teeth will erupt in about 3 to 6 months. Children who are malnourished or lack calcium will have their teeth erupt late, and some will take about 1 year to have their permanent teeth erupt. Some children lose their milk incisors prematurely due to disease or trauma, such as premature loosening and root resorption caused by dental caries or apical periodontitis, or premature loosening and loss of milk incisors due to trauma. At this time, the permanent tooth embryo is not ready for replacement, and a tough mucous membrane forms on the surface of the gums, resulting in delayed eruption. If a permanent tooth is lost in a child, no new tooth will grow. It is necessary to clean the missing tooth in time, put it back into the socket immediately and secure it with a gauze bite, and go to the hospital as soon as possible.