Nowacki, Luciana Cristina, Paulo Roberto Worfel, Paulo Francisco Arant Martins, Rosane Sampaio dos Santos, José Stechman-Neto, and Wesley Mauricio de Souza. 2015. “Analgesic Effect of Hypericum Perforatum, Valeriana Officinalis and Piper Methysticum for Orofacial Pain”. Brazilian Journal of Oral Sciences 14 (1). Limeira, SP:60-65. https://periodicos.sbu.unicamp.br/ojs/index.php/bjos/article/view/8640847.