In an ideal female face, the lower third of the face including the jawline is narrower compared to the upper two thirds and follows the optimal inverted pyramid shape. In an ideal male face, the lower third of the face including the jawline demonstrates a more square appearance.
Dr. Ho believes that while every face is unique, the ideal jawline possesses a youthful, sharp definition and is harmonious with the rest of the face. In an ideal female face, the lower third of the face including the jawline is more narrow and tapered compared to the upper two thirds and contributes to the optimal inverted pyramid shape. In an ideal male face, the lower third of the face including the jawline follows a more square appearance. Furthermore, the ideal jawline demonstrates adequate chin projection as well. The most anterior point of an ideal chin should be at or approach a vertical line referred to as the Zero Meridian of Gonzalez-Ulloa that runs through the nasion (root of the nose) and is perpendicular to the Frankfort horizontal line, which runs through the inferior orbital rim and superior limit of the ear canal.
On profile view, the most anterior point of an ideal chin should be at or approach a vertical line (Zero Meridian of Gonzalez-Ulloa) that runs through the root of the nose and is perpendicular to a horizontal line that runs through the inferior orbital rim and superior limit of the ear canal (Frankfort horizontal line).