Orthognathic surgery involves repositioning one or both jaws into a correct functional alignment. Typically, the overall balance of the face will be simultaneously improved, for example: Correction of facial asymmetry to one of right and left balance. Improvement of a flat or concave facial profile to one that is more convex. Correction of an overly long, thin face to a more rounded or heart-shaped appearance. Increased prominence of the cheekbones. Having one's chin in a more cosmetically pleasing shape and position. Having a more well-defined lower jawline. Loss of a double chin or sloping neckline creates a more attractive transition between the lower jaw and neck.