The chin has been called the "anchor of the face" and may greatly alter perception of the lips, nose, and jaw.
In the Orient, a protruding chin is seen as a masculine feature, while a retruded chin can make the face look square from the front and underdeveloped in profile.
The anatomy of the chin is covered here.
Side profile or facial asymmetry can often be better balanced by undergoing either augmentation, reduction, or moving the bones of the chin.
Oral maxillofacial surgery on the bone or placement of synthetic implants can help address noticeable shortcomings.