Generally, a 5 year old child’s baby teeth can grow back when they are knocked out. Usually, children should be around 6 years old, so if a 5 year old child’s teeth are not replaced by milk teeth, they can still grow new permanent teeth when they are replaced in the future. However, trauma to the milk teeth may affect the growth and development of the permanent teeth, so after the teeth are knocked out, it is necessary to follow up and observe them regularly. Damaged permanent teeth are usually unable to grow back, so it is important to protect your child from them in daily life. At the same time, you should brush your child’s teeth carefully to ensure the hygiene of his or her mouth, and take him or her to the hospital for regular oral checkups, so as to prevent damage and loosening of his or her teeth. To summarize, parents are advised to take their children to the hospital for periodontal health checkups to prevent damage to their children’s gums.