Objective: To evaluate color and roughness of bovine enamel exposed to dentifrices,
dental bleaching with 35% hydrogen peroxide (HP), and erosion/staining by red wine.
Methods: Bovine enamel blocks were exposed to: artificial saliva (control), Oral-B Pro-Health (stannous
fluoride with sodium fluoride, SF), Sensodyne Repair & Protect (bioactive glass, BG), Colgate
Pro-Relief (arginine and calcium carbonate, AR), or Chitodent (chitosan, CHI). After toothpaste
exposure, half (n=12) of the samples were bleached (35% HP), and the other half were not
(n=12). The color (CIE L*a* b*, ΔE), surface roughness (Ra), and scanning electron microscopy
were evaluated. Color and roughness were assessed at baseline, post-dentifrice and/or -dental
bleaching, and after red wine. The data were subjected to analysis of variance (ANOVA) (ΔE) for
repeated measures (Ra), followed by Tukey´s test. The L*, a*, and b* values were analyzed by generalized
linear models (a=0.05).
Results: The HP promoted an increase in Ra values; however, the SF, BG, and AR did not enable
this alteration. After red wine, all groups apart from SF (unbleached) showed increases in Ra values;
SF and AR promoted decreases in L* values; AR demonstrated higher ΔE values, differing
from the control; and CHI decreased the L* variation in the unbleached group.
Conclusion: Dentifrices did not interfere with the bleaching efficacy of 35% HP. However, dentifrices
acted as a preventive agent against surface alteration from dental bleaching (BG, SF, and
AR) or red wine (SF). Dentifrices can decrease (CHI) or increase (AR and SF) staining by red