Some studies have shown that bleaching is enough to improve esthetics results. Active agents of carbamide
peroxide (10-20%) and hydrogen peroxide (1-10%) can be used on vital teeth (30). The association of home and
in-office bleaching is interesting in more resistant cases or when the time of treatment has to be shortened. In these cases, the treatment must begin with 35% hydrogen peroxide, and be followed by home teeth bleaching under
professional supervision.