Effectiveness of Experimental Whitening Toothpastes Containing Colorants on the Optical Properties of Enamel

Table 4

Results of the chemical and physical analyses of the toothpaste slurries.

Product	pH	Particle size (nm)	Zeta (mV)	Polydispersity index
PHT	7.12	412.8 (9.6)	0.71 (0.33)	0.31 (0.03)
SDG	4.86	386.2 (14.1)	−0.12 (0.37)	0.34 (0.01)
WRP	9.70	353.5 (10.3)	0.48 (0.47)	0.19 (0.03)
STW	8.76	266.2 (13.9)	1.37 (1.07)	0.18 (0.03)
SWS	5.85	297.3 (9.5)	−0.84 (0.50)	0.18 (0.03)

pH of the slurry.