Botulinum toxin type-A has also been used in the treatment of gummy smiles;[167] the material is injected into the hyperactive muscles of higher lip, which causes a reduction while in the upward motion of lip Consequently causing a smile that has a significantly less publicity of gingiva. SNARE proteins https://andresiucio.wikiparticularization.com/1557982/everything_about_botulinum_toxins_exotoxins_of_clostridium_botulinum