There is no upper limit to the age of orthodontic treatment . It can be treated at any age.However , as stated in the section on the start of treatment, the amount and direction of growth of the upper and lower jaws must be adjusted during the growth period In this case,it is not possible to adjust the three-dimensional positional relationship of the jaws along the growth.For this reason,the upper and lower teeth are moved based on the relationship between the upper and lower jaws with a three-dimensional displacement.It is possible to consider the correct meshing on the current base. The amount of tooth movement will increase due to the deviation of the upper and lower jaws, which may increase the number of teeth to be extracted. If the deviation of the upper and lower jaws are significant only tooth movement is not harmonious movement of the upper and lower jaws, the distance that can move teeth, because there is a limit,move surgically jaw serving as a base of the treatment It becomes.