Frown lines are the result of gathering or knitting the tissue between the eyebrows into a fold. These unattractive folds and furrows are caused by the repeated action of underlying muscles associated with facial expression. Years of squinting and frowning tend to leave deep wrinkles in the skin between the eyebrows and on the bridge of the nose, across the forehead and at the corners of the eyes. On many people, frown lines produce and angry or sad look that detracts from a pleasant facial appearance. Dermatologic surgeons can now improve these wrinkles and lines without surgery, without scars and usually without any “down time” by a simple injection of botulinum toxin.