Methods & Material: Twenty-four subjects, without systemic diseases, with plaque-induced gingivitis will be selected for this study. The patients were treated with scaling and root planing at the baseline; Oral hygiene instructions were given that included brushing twice- daily, The volunteers brushed their teeth with the Bass brushing technique for at least 2 minutes, these patients were randomly ,equally divided into two groups, Group A: perform daily mouthwashes twice a day with the solution containing 10 ml of 0.05 cetyl pyridinium, (Vi-one, Rojin, Cosmetic-Lab, Kurdistan -Iran), Group B: use daily mouthwashes twice a day with 10ml of the chlorhexidine(Kin Laboratories, Spain), On day 0,7,15 and day 21 of each phase the Plaque Index (PI), Pocket depth(PD), Stain Index(SI) and Bleeding Index (BI) of each volunteer were measured.