A “gummy” smile is one where excessive gingiva (gum tissue) shows when you’re laughing or smiling. One of the reasons this can happen is because of hyperactive muscles in your upper lip.
When Botox is applied just under your lip, it helps those muscles to relax. As a result, your upper lip drops just a small amount so that it doesn’t come up as high when you’re smiling. Consequently, it covers some of that gingiva so that you’re seeing more tooth than gums. Botox treatment in dentistry eliminates the need for surgery!