Botulinum toxin type-A has also been used in the treatment of gummy smiles;[167] the material is injected in to the hyperactive muscles of higher lip, which causes a discount from the upward motion of lip Consequently resulting in a smile by using a fewer exposure of gingiva. University-centered ophthalmologists https://claytonfpyfl.wikissl.com/1537539/5_essential_elements_for_how_does_clostridium_botulinum_produce_toxins