You may want to turn that frown upside down. Along with several other things such as dramatic expressions, sleeping on your side, aging, smoking, or excessive UV exposure, frowning can cause forehead wrinkles. These face wrinkles are often virtually invisible to anyone else but could make you feel self-conscious. Plus, they could be a sign of skin damage and act as a wakeup call that will inspire you to start looking after your skin. Rather than hiding your forehead under bangs or a hat, try these simple, natural tricks to tighten your skin and reduce fine lines.