Some people feel that when they smile they show too much of their gums, or that their gums are simply too prominent when they smile – this is often referred to as a ‘gummy smile’. Gummy Smile is a phenomenon that when some people smile, their upper lip elevates too far above their upper teeth, exposing gums and producing an unattractive smile. One of the causes is a hyperactive muscle which elevates the upper lip. Occasionally, the gummy smile is also aggravated by a thin upper lip that further contributes to the problem by exposing the upper gum even more. Fortunately, gummy smile can be simply and effectively corrected with Botulinum toxin injections to reduce the activity of the muscle that elevates the upper lip.In either case, the underlying cause is the same: the overuse of certain facial muscles.