Frown lines, forehead lines and crow's feet are caused by the constant movement of muscles underneath the skin. For example, a wrinkle in the area between the eyebrows may appear and persist because of the repeated, often unconscious, action of frowning. This is the same for lines by the eyes, often called crow's feet, which are caused by smiling or squinting. Raising the eyebrows often result in forehead lines.
If dynamic wrinkles make you look older than you are, cosmetic denervation can smooth these out and give you a more youthful and pleasant appearance.
Now, dynamic lines can be dramatically softened. The procedure known as cosmetic denervation uses Botox injections to improve the appearence of worry lines, frown lines, laugh lines, crow's feet and other dynamics wrinkles.