Botox is a manufactured medication that is injected into muscles to prevent their contractions. Without contraction, there can be no movement of the overlying skin and no wrinkles can be formed. Botox is widely used to treat the frown lines between the eyebrows, the horizontal forehead lines, the wrinkles at the outer corners of the eyes (crow's feet), and the vertical wrinkles radiating from the lips. Any licensed physician or dentist can legally prescribe a FDA approved medication for "off-label" use in any way that is considered standard of care and of benefit to the patient. Results typically last 3-6 months, while retreatments can last considerably longer.