Control treatment: A light-cured resin dam will be applied (Top Dam, FGM, Joinville, SC, Brazil) on the gingival tissue corresponding to the teeth to be bleached. A 35% hydrogen peroxide based bleaching agent (Whiteness HP Maxx, FGM, Joinville, SC, Brazil) will be mixed and applied on the vestibular surface of teeth, in the ratio of 1 drop every 3 to the thickener and peroxide, remaining for 45 minutes. After this time, the bleaching agent will be removed. A second session will be as carried out after 1 week following the same procedures.