After the failure of permanent tooth reimplantation in children, dental implantation or dental transplantation can be chosen to restore the missing teeth about 2~3 months after tooth loss. Failure of permanent tooth reimplantation may be related to the fact that the tooth has been lost for too long, has not been properly preserved after loss, the root of the tooth has been fractured, or the tissues surrounding the tooth have been inflamed or diseased. Dental implants are made of pure titanium metal that is designed and manufactured to resemble the shape of a tooth root and implanted into the alveolar bone. After 1~3 months, the artificial tooth root is tightly bonded with the alveolar bone, and then a porcelain crown is made on top of the artificial tooth root. Dental implants are very similar to natural teeth in function and aesthetics, and have been recognized by the dental community as the preferred restoration method for missing teeth. Dental implants are categorized into autogenous dental implants and allogenic dental implants. If a child has a complete healthy tooth that has been extracted due to orthodontic needs, etc., the missing tooth can be filled in with an autogenous dental implant. In the case of allografts, a suitable tooth from the dental bank is selected to fill the defect. It is recommended to practice good oral hygiene and dietary habits to improve the success rate of filling the defects, and to follow the doctor’s instructions for regular checkups.