ABSTRACT: The correction of skeletal discrepancies requires Orthognathic surgery along with Orthodontic treatment .Surgery first- orthognathic approach (SFOA) was proposed by Nagasaka et al, a new concept in the combination of orthodontic- orthognathic treatment for jaw deformities [1]. Before performing Orthodontic treatment early correction of soft tissue and skeletal problems may be easier for the tooth movement. Nowadays, most of the orthodontic centers in the world prefer surgery first followed by orthodontic treatment. The regional acceleratory phenomenon (RAP) is a tissue reaction to a noxious stimulus that increases the healing capacities of the affected tissues. RAP is a key factor that shows a notable reduction in treatment duration during SFOA.