Abstract
The objective of this study will be to evaluate in vitro a new bleaching agent containing nanoparticles of Sodium trimetaphosphate (TMP) associated with sodium fluoride (F) and 17.5% hydrogen peroxide about aesthetic effectiveness, surface hardness, and roughness of tooth enamel. The whitening gels will be applied on bovine tooth discs, according to the groups: 1) 17.5% hydrogen peroxide …