When a hypermobile lip is the cause of the “gummy” smile, doctors traditionally will perform a surgery to limit the muscles that elevate the upper lip so it can no longer rise as high.
In extreme cases, they might perform orthognathic jaw surgery, which repositions the upper jaw if it sticks out too much. But this can be complicated often requiring braces and can take up to two years to complete.
Now people are going another route to treat these hypermobile lips or excessive protruding upper jaw bone i.e. Botox. For the last few years, dentists have been injecting Botox into the upper lip “elevator” muscles. It paralyzes the muscles, inhibiting contraction of the upper lip when smiling to prevent the gummy smile.