Leading with the chin: facial rejuvenation of the lower third

The facial lower third and chin contribute significantly to overall facial balance. Beginning with an anatomical exploration, this article defines the chin's unique features and the evolutionary significance of its projection in humans. The often-overlooked senescent changes of the chin are discussed, as well as congenital contour and projection defects. A sequential treatment model is offered to manage these inherent and acquired lower-third deformities.