Because the role of microorganisms in the causation and pathogenesis of periodontal disease is well documented,therapy is directed primarily towards reducing the number of pathogenic in contact with periodontal tissues.Therefore,mechanical plaque removal is the basis of most periodontal treatment regimens.

    The toothbrush is the most frequently used oral hygience device.Irrespective of design,the function of toothbrush is simple:plaque is disrupted by the mechanical action of bristles and swept away from the surface.The cleaning efficacy of a toothbrush correlates with brushing time and is significantly enhanced by the use of toothpaste.There is,however,only a low correlation between applied pressure and brushing effectiveness.

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