The best age for orthodontic treatment is usually at the age of 12 or 13 years. Orthodontics is a type of orthodontic treatment for teeth, which is used to align teeth and create a good bite. The best age for orthodontic treatment depends on the particulars of the teeth. If the teeth are simply uneven, crowded or have tiger teeth, orthodontic treatment can be performed. The best age for orthodontic treatment is 12 or 13 years old, after the teeth have been completely replaced, all baby teeth have fallen out and all permanent teeth have erupted. If the teeth are backward due to bad habits, also known as “enameled teeth”, early intervention is needed, otherwise it will form a bony deformity. Early orthodontic treatment is usually possible when the child is about three and a half years old and can cooperate with the doctor in taking impressions. This age also includes early functional training, which can be done before school age. In cases where there is a family genetic predisposition, such as genetically caused overdevelopment of the upper and lower jaws, which needs to wait until after the developmental period, orthodontic treatment and orthognathic surgical treatment can be considered. Therefore, orthodontic treatment is usually performed after the complete replacement of teeth at the age of 12 or 13 weeks, or early orthodontic treatment can be performed around the age of three and a half.