Figure 4
From: In vitro tooth whitening effect of two medicated chewing gums compared to a whitening gum and saliva
Quantitative evaluation of the stain removal. Percentage of total stain removed as overall change color (ΔE) by various chewing gums (A, B and C) and freshly stimulated saliva after 60 min and 120 min of in vitro mastication (mean ± standard deviation of 16 samples). Note: Bars with the same number of asterisks at the same time point are not statistically different. Gums A and B versus C or saliva, as well as C versus saliva, are significantly different (at p < 0.01) at 60 and 120 min.