Upper jaw bone is known as the maxilla, while the lower jaw bone is called the mandible. For the mandible and its main muscle, the masseter, are the primary anatomic factors determining the width and shape of the lower called the “jaw line.”
Some Asian women prefer a more slender jaw profile to a stronger square or flared contour that might feel out of proportion to other more delicate facial features. Slimming does soften the facial contour and cam make the neck appear slightly longer. Some women feel a square jawline makes them appear less feminine, although this argument is flawed. There are countless beautiful women with extremely square jaws and many handsome men with highly angled jaw. Jawline reduction can be undertaken using either permanent surgical or temporary non-surgical methods.
Surgical reduction of the mandibular angle is particularly effective in changing a square –shaped face into one with a more oval contour.