Method: The test toothpastes were: Colgate Optic White (OW) a dentifrice containing peroxide, as well as calcium pyrophosphate abrasive, Crest® 3D White Luxe Glamorous White (C3D) containing pyrophosphate and silica abrasive, and Crest® Cavity Protection (CCP) a non-whitening dentifrice. Unstained white bovine incisor enamel specimen, were sanded for 4 minutes to flatten their natural curvature. Baseline values of the bovine specimen were measured using the Novo-Curve (60°) gloss meter and then divided into three groups (n=6). The gloss was measured twice at four 90° rotations of the bovine enamel specimens and the average reported. The enamel specimens were mounted in trays and then brushed for 800 strokes at a rate of 120 strokes per minute with a manual flat-trim soft toothbrush and 250 grams of applied force. After brushing, the teeth specimens were rinsed, removed from the tray, patted dry, and gloss values were measured. The increase in gloss relative to the baseline gloss value was reported. ANOVA was used to compare the mean change in gloss for each product.
Result: The increase in gloss after 800 strokes of OW was 40.5(±8.2) ΔGU and was statistically significantly (p<0.05) higher than that of C3D, 19.1(±7.2) ΔGU, and CCP, 14.0(±5.5) ΔGU. In addition, the EPP value of OW was 24.68(±1.85) ΔGU, which was statistically significantly (p<0.05) better than CCP 18.43(±1.17) ΔGU.
Conclusion: OW demonstrated a statistically significant increase in gloss compared to C3D and to CCP in an accelerated gloss model and in the industry standard EPP testing.