If the child’s tooth is knocked out, if only the crown is partially missing and part of the crown is knocked out, this situation will not grow again. After the hard tissue of the tooth is traumatized or defective, the appearance can only be restored by repairing, resin filling, porcelain crown repair can be done, if the whole tooth is knocked out, it depends on the situation as follows: 1, it will grow again: after the milk tooth is knocked out, the new permanent tooth will erupt again in the future, however, the trauma of the milk tooth may have an effect on the growth and development of the permanent tooth, and it is necessary to have regular follow-up observation after the milk tooth is knocked out. 2, it will not grow again: the milk tooth will grow back again, but the trauma of the milk tooth may affect the growth and development of the permanent tooth. Follow-up observation, if necessary, take pictures to see the growth and development of permanent teeth. 2, will not grow again: after the permanent teeth fall out, it is impossible to grow again, in childhood, you can do a simple movable gap keeper to restore the function, usually wait until adulthood, and then permanent crown restoration. Whether or not a child’s teeth can grow back after they are knocked out depends on whether they are milk teeth or permanent teeth. Usually they are milk teeth until the age of six, and after they are knocked out they may grow back permanent teeth. After the age of six, it is often a new permanent tooth that will not grow back if it is knocked out and will only be restored in the future.