Fig. 9
From: Ex vivo comparative study of at home bleaching products on whitening efficacy and enamel integrity
Measure the pH value of the whitening agent before and after the treatment of bovine mandible teeth. For each whitening agent, the first column represents the pH value at the initial time point (pH T0), the second after 4 h of treatment (pH T4), and the third after 8 h (pH T8). The x-axis labels represent the treatment groups. The symbol * indicates a significant difference (p < 0.05) compared to the values measured for Blanc and Opale.
