This procedure is mainly designed for patients who have very mild mandible protrusion or outward expansion and who do not need to undergo bone resection but want to soften the contour of their lower faces. This procedure is very similar to the mandible reduction. Dr. Chuang will cut open a 3-cm incision in the lower gum and then, grind off the protruding or outward extending parts of the mandible with a high-speed electric burring system until both sides are symmetric. The goal of this procedure is to soften the jawline contour or improve the condition of the fleshy lower face, without reducing the real width of the face. Its result on face slimming is not obvious; the face width can be reduced to a maximum of approximately 0.3–0.5 cm on each side, which is similar to the result of a long-term botulinum toxin injection. This surgery is suitable only for patients with a slightly wide face who do not want to substantially change their face shape or repeatedly have botulinum toxin injections. For enhancing the surgical result, Dr. Chuang usually combines the partial removal of the masseter muscle with this surgery to achieve the stable result of face slimming and avoid the possibility of bone regeneration in the future due to constant dragging of the masseter muscle.