Smile confidently with gummy smile injection at the GHB Clinic. Gummy smile treatment is used to reduce the proportion of gums that are displayed when a person smiles. This can occur when the upper lip excessively elevates where the upper teeth sit, which exposes the gums. Gummy smile can be caused by an unaligned jaw, a hyperactive upper lip, a thin upper lip, genetics, an excess of gum tissue, along with several other causes. Gummy smile can be effectively treated using anti wrinkle injections to target the muscle that causes the gums to be excessively displayed.