Double jaw surgery is a procedure performed to improve cases where the lower jaw appears to protrude significantly forward, cases with facial asymmetry, protruding mouth, or a receding chin accompanied by severe lower jaw underdevelopment. It can be highly effective in reducing the length of the face.

If the length of the face is reduced through double jaw surgery, the face may appear much shorter in length, but the side cheekbones can make the face look wider.
Therefore, if the width of the side cheekbones appears somewhat broad, it is necessary to perform double jaw surgery together with cheekbone reduction surgery to reduce the side cheekbones.

If double jaw surgery is performed to reduce the length of the face while cheekbone reduction surgery is done at the same time, the result can be a reduction in both the width and length of the face.