The size of the jawbone, or mandible, and its main muscle, the masseter, are the primary anatomic factors determining the width and shape of the lower face.

Many Asian patients 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.

Some women feel a square jawline makes them appear less feminine.

Reduction of the mandibular angle is particularly effective in changing a round or angular shaped face into a more oval contour.

Jaw reduction may be undertaken using surgical or non-surgical methods and is not infrequently done in conjunction with chin augmentation.