Objective: The objective of this study was to evaluate the degree of color change of teeth, and sensitivities of teeth and gums in an in vivo study. Methods: Ranir Whitening Wraps™ (WW2) and Crest Whitestrips® Premium (WP2) were used twice a day and Ranir Whitening Wraps™ (WW1) were used once a day according to manufacturer's instructions. Color evaluations occurred at baseline, after five and seven-day use of bleaching agent and 14 days post-bleaching. Color change was evaluated objectively using ShadeEye™ and subjectively using Trubyte® Bioform Color Ordered Shade Guide. Sensitivity evaluations were also accomplished. Results: Seventy-six of the seventy-eight subjects enrolled completed the study. All three groups had significant mean changes from baseline to 14 days post-bleaching in Delta L*, Delta a*, Delta b*, Delta E and Delta shade guide values (p<0.001). Subjects using WW2 were significantly lighter overall in tooth whitening than those using WP2 in Delta L* (p=0.0208) and Delta shade guide (p=0.0079) and improved, but not significantly so, in all other color measuring parameters and in all parameters than those using WW1. Subjects using WP2 were significantly lighter overall in tooth whitening than those using WW1 in Delta a*(p=0.0029), Delta b*(p=0.0022), and Delta E (p=0.0063) and improved, but not significantly so, in all other color measuring parameters. There were no differences between the three groups for tooth sensitivity (p=0.42) but WP2 (p=0.0167) and WW1 (p=0.0362) caused less gingival sensitivity than WW2. Conclusions: All three products significantly lightened teeth. WW2 lightened more than WP2 in L* and shade guide and WW1 in all color measuring parameters. WP2 lightened more than WW1 in a*, b*, and E. There was no difference in tooth sensitivity but WW1 and WP2 caused less gingival sensitivity than WW2.

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