Gummy smile is a term for the type of smile that exposes a large part of the upper gums. In a “regular” smile, the upper lip moves slightly above the teeth. In a gummy smile, it moves higher and reveals at least four millimeters of the gum tissue. Botox when injected can relax the muscles in the upper lip and limit the rise of the upper lip when smiling, so the gums will remain covered. Two or more units of Botox are injected in the area between the nose and upper lip to reduce the appearance of any “gummy” smile, creating a more appealing and natural smile.