Orthognathic Surgery is needed when the top and bottom jaws don't meet correctly and/or teeth don't adequately fit within the jaw. Teeth are straightened with orthodontics, and corrective jaw surgery repositions a misaligned jaw. This not only improves facial appearance, but also ensures that teeth meet correctly and function properly. People who can benefit from orthognathic surgery include those with an improper bite, or jaws that are positioned incorrectly. Jaw growth is a gradual process and in some instances, the upper and lower jaws may grow at different rates.