Orthodontic treatment can be performed at the age of 27 to correct malalignment of teeth in the mouth, which requires treatment of other diseases in the mouth including periodontitis and pulpitis prior to orthodontic treatment, as described below. Because the alveolar bone has the function of being remodelable, adults at the age of 27 can undergo orthodontic treatment to correct malocclusion such as maxillary protrusion, mandibular protrusion, and crowding of teeth. You can choose from labial fixed orthodontics, lingual fixed orthodontics, and invisible removable orthodontics. Before orthodontic treatment, it is necessary to treat other diseases in the oral cavity, including perfect periodontal sequence treatment for periodontitis, root canal treatment for pulpitis, removal of wisdom teeth that repeatedly cause wisdom teeth pericoronitis, etc., and establish good oral hygiene habits. It is recommended to visit a regular medical institution to receive professional treatment.