Orthognathic surgery is usually the final phase of treatment for patients with cleft lip and palate (CLP). More than 25% of patients with CLP develop a significant maxillary hypoplasia that requires surgical intervention, and maxillary osteotomy is, therefore, most commonly performed for these patients. If the sagittal discrepancy is too large or if there are associated mandibular deformities (e.g., asymmetries, canting of the mandibular occlusal plane), a simultaneous setback of the mandible is performed. The bilateral sagittal split osteotomy (BSSO) has become the preferred mandibular osteotomy in many centers for the treatment of mandibular deformities. Nevertheless, this treatment is known to give rise to various complications; sensory disturbance of the inferior alveolar nerve (IAN) is probably the most common one with the incidence ranging from 8% to 85%. Such sensory disturbances may affect patients' quality of life due to the difficulties in speech, eating and drinking. Patients may also complain about the inability to assess tactile stimuli such as putting on lipstick, shaving or kissing, which may lead to psychological and social issues.