Sensory re-training will be compared to a placebo jaw-opening exercise in a single blind, randomized two-arm parallel group stratified block clinical trial, using orthognathic surgery patients as subjects. Orthognathic surgery patients offer an uncompromised model for the evaluation of new rehabilitative therapies. These healthy individuals, treated to correct dentofacial deformity, present for surgery with no neurosensory impairment, but yet routinely experience substantial alterations in facial sensation following the surgical procedure. The effects of sensory re-training will be evaluated using three types of outcomes: patient-centered measures to assess the magnitude of the negative effect of altered sensation after surgery and the recovery time needed to reach little or no negative effect; neurosensory behavior measures to assess the patient's ability to learn alternate cues for touch perception and discrimination; and a conventional neurosensory contact threshold measure to assess the actual deficit. Our primary focus will be on the patient's perception of the negative impact of altered sensation on daily life.