Dental plaque is one of the etiologic factors in gingival and periodontal disease. Considering the uses of lemongrass oil the aim of the present study was to find out the antiplaque property in vitro. Pooled saliva was put into the tissue culture plates and incubated for 72 hours for plaque. Each of the 4 wells were treated differently with using disclosing agent, lemongrass oil mouthwas...