L. C. Mendonça, L. Z. Naves, L. da F. R. Garcia, L. Correr-Sobrinho, C. J. Soares, and P. S. Quagliatto, “Permeability, roughness and topography of enamel after bleaching: tracking channels of penetration with silver nitrate”, Braz. J. Oral Sci., vol. 10, no. 1, pp. 1–6, Nov. 2015.