The attractive faces are always balanced faces.
Much time and energy has gone into measuring and correlating the relationships of the boney anatomy and developing normative data. The collective data is called cephalometrics.
This data has led to terms to discuss the chin and its relationship to the other anatomical landmarks of the face as it relates to the chin
Micrognathia: is when the chin and lower jaw is small in size
Retrognathia: is when the chin is displaced backwards
macrognathia: is a large protruding lower jaw
For major imbalances surgical correction is referred to as orthognathic surgery: correcting the deformities of the jaw and the associated malocclusion of the teeth .
For the common minor imbalances of the chin due to its small size a chin implant is often placed to create balance and better definition of the lower jaw line.