When the pressure is applied to the left and right edges of the face by the HEADrang P-plates, tension (elongation of bone) occurs at the central part of the jawbone in V-line form. The bone is a living organism, repeating destruction and generation periodically.

Therefore, in the process of bone elongation, the number and activity of osteoblasts (cells responsible for the generation of bone) and osteoclasts (cells responsible for the destruction of bone) increase; the process of bone destruction and regeneration occur naturally in the process of jaw deformation.

This destruction and generation of bones enables the contour change of the center of the blunt jaw bone.

This process is a phenomenon occurring to compensate for the elongation of the jaw, changing the blunt ‘U’-shaped jawbone to V-line gradually.