According to a research, human chins did not develop because of mechanical forces like chewing, but an evolutionary adaptation related to face size and shape led to its development. This evolutionary adaptation is probably associated with changes in hormone levels as humans became more social.

According to Nathan Holton who studies craniofacial features and mechanics at University of Iowa, primates or the Neanderthals did not have chins and one way or another, it seems unimportant but the reason behind it is quite interesting.

According to Holton, "As our faces became smaller in our evolution from archaic humans to today - in fact, our faces are roughly 15 percent shorter than the Neanderthals - the chin became a bony prominence, the adapted, pointy emblem at the bottom of our face".

The research team used advanced facial and cranial biomechanical analyses with almost 40 people and found that mechanical forces, together with chewing, seem to be ineffective in producing the resistance required for new bone to be developed in the lower mandible, or jaw area. It seems that the emergence of the chin in modern humans occurred because of simple geometry.

Human chin evolved because of change in lifestyle of humans, which began at about 80,000 years ago.

Human chin is a secondary consequence of our lifestyle change, starting about 80,000 years ago. Hunter-gatherer groups led to emergence of chin in humans. These groups were somewhat isolated from each other to increasingly social groups.

The groups, which were more connected, seem to be involved more in art and other symbolic mediums. During this period, males especially became more tranquil and used to fight less for things.