Orthognathic Surgery (Orthos (straight), gnathos (jaw)) refers to the surgical procedures that are used to correct deformities of upper and lower jaws, or to bring these into better alignment for aesthetic and/or functional purpose. Jaws may be moved forward, backward, up, down or rotated to achieve a better harmony and function. Unlike Orthodontia, which involves the use of braces, to correct relatively minor discrepancies in dental relations (occlusion), Orthognathic Surgery is able to correct major imbalances between the jaws.