In situ effect of chewing gum with and without CPP-ACP on enamel surface hardness subsequent to ex vivo acid challenge - Jordão, M. C.; Alencar C .R. B.; Mesquita, I. M.; Magalhães, Ana Carolina; Buzalaf, Marília Afonso Rabelo; Machado, Maria Aparecida de Andrade Moreira; Honório, Heitor Marques; Rios, Daniela (Caries Research, 2016)