Many of the wrinkles that develop on our faces as we age are the result of the repeated contraction of certain muscles of expression. This is particularly true for the wrinkles around the outer edges of our eyes, or “crow’s feet”, the horizontal lines across our foreheads and vertical “frown lines” that are often noticeable between our eyebrows. It is the contraction of the muscles of expression over many years that etches wrinkles into skin that overlays them. Years of squinting, smiling, frowning, and worrying, create creases or wrinkles in the skin over the muscles performing these actions.