Materials & Methods: Thirty-seven systemically healthy patients (18 males, 19 females) with the age range of 13-18 years were involved in this split-mouth study. Clinical evaluations, quantitative light-induced fluorescence (QLF) imaging, GCF and plaque samplings were performed at baseline and at 1-, 2-, 3-months. QLF was repeated following debonding, GCF samples were analyzed by immunoassay and real-time PCR for the biomarker and bacteria content. Data were analyzed by Wilcoxon on dependent samples.