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. 2023 Jan 17;15(2):82. doi: 10.3390/toxins15020082

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© 2023 by the author.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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Gummy smile (A) injection points, (B) before injection, (C) after injection. LLSAN, Levator labii superioris alaeque nasi; LLS, Levator labii superioris; Zmi: zygomaticus minor; OOr: orbicularis oris, DAO: depressor anguli oris.