Clinical evaluation of Colgate Platinum Professional Toothwhitening System and Rembrandt Lighten Bleaching Gel

A 2-week study was conducted to evaluate the tooth-whitening efficacy of Colgate Platinum Professional Toothwhitening System vs Rembrandt Lighten Bleaching Gel. Thirty-eight subjects completed this single-blind, randomized, parallel clinical study. The subjects were balanced into two groups based on a minimal shade of A3 on the Vita shade guide. The duration of product use was 30 minutes, twice daily for 2 weeks. Change in toodth color was measured by reflectance spectroscopy using a colorimeter. The readings were taken in the L*, a*, and b* color space at the initiation of the study, at 1 week, and at 2 weeks. Calculation of color change (deltaE) was performed using the color difference equation established by the Commission International de L'Eclairage. Results demonstated that Colgate Platinum was 46% more effective at tooth whitening after 1 week, and 96% more effective after 2 weeks of treatment. The results demonstrated that the Colgate product was significantly superior vs Rembrandt at increasing tooth whiteness (increase in deltaE), and tooth lightness (increase in deltaL*). No adverse reations were noted on clinical examination.