There are two types of incisor loss in children, one is the natural loss of baby teeth and the other is the loss of permanent teeth due to trauma. After the natural loss of milk teeth, new permanent teeth can usually grow in after six months. If the permanent teeth have already been replaced, they will not grow back. The incisors are divided into central incisors (front incisors) and lateral incisors (teeth on either side of the incisors). The central incisors fall out around the age of eight and are replaced by new permanent teeth within six months. The lateral incisors fall out naturally around the age of nine, and the permanent teeth erupt in the same time as the central incisors, which also takes about six months. If a child loses a permanent tooth due to trauma, it is not possible to grow a new tooth, so he or she should go to a regular dental clinic or hospital dentistry department and take reasonable treatment under the guidance of a dentist. Children do not have the awareness and ability to protect their own teeth, so parents should give appropriate assistance. Once all permanent teeth have erupted, it is important to urge children to brush their teeth regularly to prevent tooth decay. It is also important to help children to protect their permanent teeth from trauma.