The best age for children to have their teeth straightened is around 12-14 years old, when the child’s teeth are basically fully erupted. However, this rule cannot be fully followed for specific children, because there are many cases that require pre-intervention, such as anterior retrusion during the period of dentition to avoid affecting the development of the child’s maxilla, which generally requires intervention around 4-5 years of age. The anterior retrusion of some children during the period of dentition also affects the jaw development and requires timely intervention. For severe bony malocclusion, orthodontic and surgical solutions are required only after adulthood.