IRCT20191225045891N1 IRCT 2020-01-31 Hamedan University of Medical Sciences Glycyrrhiza glabra, salvia officinalis and zinc extract mouth wash on oral health The effect of glycyrrhiza glabra, salvia officinalis and zinc extract mouth wash on oral health of dental students: Clinical trial study 2020-04-20 anticipated 200 Complete https://irct.ir/trial/44529 interventional Randomization: Not randomized, Blinding: Triple blinded, Placebo: Used, Assignment: Parallel, Purpose: Prevention, Blinding description: participants, principle investigator, healthcare providers and data analyses are blinded. N/A Gingival health. Intervention 1: Intervention group: 200 dental student voluntaryselected and divided randomly to five group each group consisting 40 student. 1. control group recieve water 2. This group receive combination of glycyrrhiza glabra, Salvia officinalis and zinc mouth washes, 3. this group receive glycyrrhiza glabra, mouth washes4. this group receive Salvia officinalis mouth washes, 5. this group receive zinc mouth washes, Two file filled for all students. one before and one 15 day after intervention. each persons used mouth washes 2 times a day for 1 minutes. Files consist: biographic data, bleeding on probing, gingival index and plaque accumulation. Intervention 2: Control group: Only receive water. No - There is not a plan to make this available Justification or reason for not sharing IPD is There is no further information