Non-Surgical Management of the Gingival Smile with Botulinum Toxin A—A Systematic Review and Meta-Analysis by Carolina Rojo-Sanchis, José María Montiel-Company, Beatriz Tarazona-Álvarez, Orion Luiz Haas-Junior, María Aurora Peiró-Guijarro, Vanessa Paredes-Gallardo, Raquel Guijarro-Martínez

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