If a 7-year-old child loses incisors as milk teeth, permanent incisors can be grown within six months of the loss of milk teeth. There are two sets of teeth in a person’s life: milk teeth and permanent teeth, and the eruption of permanent teeth mostly follows the law of symmetry between left and right, lower and upper first. Most children start to have their permanent teeth erupt around the age of 6, and the baby teeth slowly fall out and are replaced by the permanent teeth. Most of the permanent incisors erupt at the age of 6-8 years. The late eruption of permanent teeth is affected by various factors, such as premature loss of milk teeth, delayed resorption of milk teeth, and calcium deficiency of trace elements. If the incisors of the milk teeth are lost for more than six months and the permanent teeth still have not erupted, it is recommended to consult a dentist for an examination as soon as possible to see if the permanent tooth germ is congenitally missing or if there is a permanent tooth germ but it fails to erupt in time, and if necessary, an eruption aid surgery can be taken. It is recommended to maintain good oral hygiene, brush your teeth carefully every day, and seek medical treatment in time for decay, so as to avoid the teeth from getting worse and worse, which will eventually be impossible to retain and even affect the surrounding teeth or the permanent teeth that have not yet erupted.