With time, we all develop habitual facial expressions that form lines and wrinkles in our skin. These actions are considered minor when thought of as a onetime gesture because skin, especially when young, is elastic in nature. However, like water flowing through a canyon, over time these gestures cause expressions to become wrinkles, and the elasticity to fade, resulting in permanent features of the face that we associate with advancing age.
The medication works by blocking a chemical release between the peripheral nerves and the affected muscles. When the muscles can no longer contract, the skin overlying the muscles become flat and the lines in the face diminish.
Over time, the treated muscles can “learn” not to make the facial expression that causes the wrinkle, resulting in long-lasting effect.