Effectiveness and mode of action of whitening dentifrices on enamel extrinsic stains

This study was conducted in order to investigate the mode of action and the whitening effect of whitening dentifrices. Two hundred fifty-six bovine enamel specimens (10 × 10 mm2) were prepared, partially stained, and assigned into eight groups (n = 32): six whitening dentifrices, one nonwhitening and deionized water (negative control), and further divided in two subgroups (n = 16), according to the test model: chemical (dentifrice slurry...