Stain Prevention Efficacy of Commercially Available Whitening Dentifrices

Objective:  To evaluate the stain prevention effects of four commercially available whitening dentifrices. Methods:  HAP discs were cycled through treatments to model daily exposure to toothpaste and stain components.  HAP discs were treated with a 1:2 (w/w) dentifrice slurries made with Colgate® Optic White, a toothpaste containing 1% peroxide and a pyrophosphate system, Crest 3D White Luxe Glamorous White, a toothpaste containing disodium pyrophosphate, Rembrandt Deeply White + Peroxide, a toothpaste containing peroxide, and Colgate® Cavity Protection Paste, a toothpaste that does not contain peroxide or pyrophosphates.  The discs were rinsed and baseline CieLAB values measured with a spectrophotometer.  Discs were cycled through three alternating exposures of a staining broth composed of coffee, tea, and wine (15 minutes), and saliva (20 minutes).  The HAP discs were treated with a 1:2 (w/w) toothpaste slurries and CieLAB values measured.  The change in whiteness before and after cycling is reported as ΔW*.  Analysis of variance was used to compare the mean DW* values with p<0.05 indicating significant differences.   Results:  The dentifrice containing peroxide and pyrophosphate after cycle completion achieved a DW* of 9.358+0.330, which is statistically significantly lower than the other tested dentifrices.   The  dentifrice containing pyrophosphate and the dentifrice containing peroxide produced DW* values of 21.260+0.681 and 21.738+0.966, respectively, and were not statistically different from each other.  The toothpaste without peroxide or pyrophosphate gave a DW* value of 32.172+0.282.  This value represented statistically significantly more staining than the other three dentifrices. Conclusions:  In vitro testing demonstrated that Colgate Optic White, a dentifrice containing a combination of 1% peroxide and pyrophosphates, provides superior stain prevention effects to other commercially available whitening dentifrices which contain only peroxide or pyrophosphates.