A gummy smile is when teeth and a significant amount of gums show when a person smiles. There are a variety of causes, from jaw and teeth development issues, to large teeth.

One cause is the muscle which controls your upper lip may being hyperactive, which causes your upper lip to rise higher than normal when you smile. If this is the case, Botox® or other botulinum toxin products can be used to reduce the action of this muscle, reducing the elevation of your upper lip when you smile.