Rovai, E. silva; de Mello Tera, T.; Carvalho de Marco, A.; Neves Jardini, M. A.; Pedrine Santamaria, M.; David Kerbauy, W. Evaluation of Dental Staining Using a Dentifrice Containing Chlorhexidine and Zinc Acetate. A Doble Blind Randomized Clinical Trial. BDS 2013, 16, 51-58.