Dynamic wrinkles or expression lines are caused by contraction of the underlying facial muscles every time you, smile, laugh or frown. Botox is a purified protein that can improve the appearance of worry lines, frown lines, laugh lines, crow’s feet and other dynamic wrinkles by relaxing the muscle. After one treatment, a patient may still frown and smile, if desired, but the expression wrinkles around the eyes and forehead are diminished when they do. Botox can give a dramatic new look of youthfulness.