Botox is a prescription medicine that is injected into muscles and used to improve the look of moderate to severe frown lines between the eyebrows for a short period of time. It works by blocking nerve impulses to the injected muscles. This reduces muscle activity that causes those lines to form between the brows.
Years of squinting, concentrating, or frowning can cause your skin to furrow and crease. As time passes your skin becomes less elastic and those moderate to severe frown lines between your brows remain, even when your muscles aren’t contracting.