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Nitrite and nitrate (NO2−/NO3−) levels (μM) in gingival crevicular fluid in the experimental (EXP) and control (CTR) groups of patients before and after the trial. N: normal range of values obtained in healthy people. * p < 0.05 vs. baseline values; ** p < 0.01 vs. baseline values; ## p < 0.01 vs. CTR.
