Surface morphology changes in human enamel, dentin and cementum following bleaching: a scanning electron microscopy study. Author: Zalkind M; Arwaz JR; Goldman A; Rotstein I Source: Endod Dent Traumatol 1996 Apr; 12(2):82-8 Abstract: Extracted human premolars were cut, cleaned and divided into 6 experimental groups. Each group was treated with one of the following bleaching materials: 30% hydrogen peroxide, 10% carbamide peroxide, sodium perborate, Nu-Smile, Opalescence and DentlBright. Morphological changes in tooth surface occurred following treatment with most bleaching agents. Hydrogen peroxide and DentlBright were associated with surface changes in all dental tissues. Hydrogen peroxide, DentlBright, Nu-Smile and Opalescence were mainly associated with surface changes in the cementum, which exhibited more changes than the other tissues.