IRCT2013021612487N1 IRCT 2013-10-22 Vice chancellor for research, Khorasgan Branch, Islamic Azad University Comparison of the antibacterial effect, tooth Staining and taste disturbance of two Iranian mouthrinses Comparison of antibacterial effect, tooth staining and taste disturbance of 0.2% and 0.12% Chlorhexidine mouth rinses in patients with Gingivitis or mild Periodontitis 2011-02-18 anticipated 26 Complete https://irct.ir/trial/12563 interventional Randomization: Randomized, Blinding: Double blinded, Placebo: Not used, Assignment: Crossover, Purpose: Prevention, Other design features: Randomization: This study had two 7days periods. During these periods the subjects used one of the mouthwashes randomly. There was a wash out period between these two periods. Randomization carried out by throwing the coin in which 26 patients divided randomly to two groups each including 13 patients. The patients of one group used the 0.2% Chlorhexidine mouthwash during the first period and the patients of the second group used the 0.12% Chlorhexidine mouthwash during the first period. Blindness: this study was double blind because the mouthwashes were given to the patients in uniform bottles by another person other than the investigator. At the end of the study he was asked to mention the set up for application of these mouthwashes by the patients. N/A gingivitis or mild periodontitis. Intervention 1: 0.2% Chlorhexidine mouthrinse, Shahrdarou, Iran. 7days twice a day 30 second, 15 mg. Intervention 2: 0.12% Chlorhexidine mouthrinse, Emad darou, Iran. 7days twice a day 30 second, 15 mg.