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This can be appreciated both at rest and with facial animation.As a youthful person speaks, the upper teeth are visible and are showcased with movement of the lips.Likewise, when the aging face smiles, the upper segment of the upper teeth and the gumline are typically hidden, as well.This relatively subtle change in proportion of the perioral components can yield the unconscious perception of an aging face.

Another example to illustrate proportional balance and youthfulness can be found in the relative size of the nose and eyes.In this process, the upper lip begins to obscure the upper teeth.As an older person speaks, the lower teeth are now visible, rather than the upper teeth.In interpersonal relations, the human face has been shown to be a key factor in mate choice during all stages of courtship.Facial attractiveness is usually processed by our brain as a result of five key elements: 1) proportional balance of facial elements, 2) uniformity of skin pigmentation and texture, 3) degree of symmetry, 4) averageness, and 5) sexual dimorphism.