Botulinum Toxin for Lip Inversion in Gummy Smile.

A gummy smile results from varied factors, including excessive muscle activity, maxillary bone variations, dental malformations, or smaller lip volume. Botulinum toxin is used to correct a gummy smile when there is excessive vertical upper lip mobility. Lip inversion can accompany a gummy smile. We report a case of lip inversion accompanying a gummy smile corrected with botulinum toxin. This simple procedure can be instituted at the stage of gummy smile correction or upon follow-up for its correction, and can obviate the need for overdosing and the use of lip fillers.