A ‘weak’ chin is a term that describes a small or undefined chin or jawline. Generally a weak chin will appear shorter and smaller in size, compared with trajectory of the nose and lips. Facial asymmetry may also cause a chin to appear weak especially where the upper lip is larger and more protruding. This tends to result in reduced definition of the chin to neck contour.
A weak chin may also occur due to genetics, a congenital defect, or as the result of trauma or injury to the jaw.
People with a weak chin may well find they have challenges with speech and eating, and may also suffer a lack of self confidence particularly in male patients whereby a strong definition to the chin or jaw can be perceived as an attractive quality to possess.