The aging process of the face is multifactorial and occurs as a result of changes in all layers, soft tissues and the underlying skeleton, which occur at different rates in different people. Facial aging should be analyzed by thirds, because not all thirds age at the same time. Diagnostics of aging based on morphogeometric changes of the face, evaluated by thirds, can become a new approach that guarantees effective and long-term correction of age-related changes using minimally invasive strategies of aesthetic medicine. Correction of the lower third of the face is a complex interdisciplinary task that requires the interaction of doctors of different specialties: dermatologists, cosmetologists, orthodontists and plastic surgeons in order to develop an optimal diagnostic algorithm and correction protocol. In this article, the authors presented a paradigm for determining the aging of the lower third of the face, not from the standpoint of visualizing obvious changes, but from the standpoint of a comprehensive assessment in accordance with the proposed parameters, including recommendations of cosmetological, orthodontic and surgical treatment protocols. The development of an individual algorithm for working with a patient is based on a comprehensive assessment of the anthropometric and psychological characteristics of the patient, the morphotype of aging, the anatomical geometry of the face, bite, Ricketts line, incisor exposure, lip profile according to Korkhaus, the severity of the angle of the lower jaw and the cervical-chin angle, as well as on the use of the Merz Aesthetics scale and the Becker scale. The use of the proposed assessment tools can help the clinician choose the optimal treatment methods.

Keywords. correction of the lower third of the face, morphotypes of aging, Ricketts line, Korkhaus lip profile, Merz scale, gonial angle, hyaluronic acid, calcium hydroxyapatite