Inclusion Criteria:  Patients who are scheduled to undergo bilateral sagittal split osteotomy surgery with Dr. Saghezchi at UCSF will be enrolled in the study. Participants must agree to return for all follow up visits during the first 3 month postoperative time period, not have any preexisting V3 nerve paresthesias, and be below the age of 45.  Exclusion Criteria:  Patients with preexisting V3 nerve paresthesias will be excluded. Pre-pubertal children will be excluded (per routine practice for this type of surgery). Patients with syndromic genetic conditions that demonstrate clearly different anatomy in the two sides of their jaws will be excluded since the two sides may not be "exchangeable".