fig2
![A comparative study of different bleaching techniques, regarding the color change, stability and postoperative hypersensitivity: a randomized controlled clinical trial](https://image.oaes.cc/f1eaadd4-e4fa-419f-a38f-79efc6c94a2a/2523.fig.2.png)
Figure 2. Bar chart representing mean values for (ΔE) at different time periods
Figure 2. Bar chart representing mean values for (ΔE) at different time periods
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