The morphological organisation of the face reflects the individual's social context and heredity and also reveal certain personality traits. Emotional facial expression is a very special form of communication. This functional and behavioural dynamic leads to the formation of a certain anatomical structure as a result of repetitive functions. The psychological examination of nineteen retrognathic patients and seven prognathic patients revealed the timid, inhibited of even anxious personality of the first group of patients in contrast with the extraverted and frequently aggressive personality of prognathic patients.