Torres CR, Jeronymo RD, da Silva EG, Huhtala MF, Gomes AP, de Luca Alves G, Munin E. Dental Bleaching with 35 and 38% Hydrogen Peroxide and Immersion in Soft Drink: Analysis by Reflectance and Fourier Transform-Raman Spectroscopy. World J Dent 2011; 2 (4):285-291.