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Color change was compared using paired t-test. Significant level was set at 5%. Results No significant difference was observed in the absolute risks of TS between groups (RR = 1.11; 95% CI 0.97 to 1.27; P = .12), which exceeded 87% for both groups. Similarly, no difference in TS intensities was detected (P .05). Significant whitening was observed with all color measurement instruments with no difference between groups (P .05). Conclusion The topical application of 10% potassium nitrate, before in-office bleaching, did not reduce
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