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Objective::Periodontal disease is cause by bacterial plaque.To treat periodontal disease,the most important part is remove plaque and infected tissue.Instruments used to prepare root surfaces mechanically should not excessively damage,gouge,trough,or remove injudicious amounts of root structure.The smoothest root possible should be one goal of successful root planing.The teeth affected by periodontal disease were treated by different therapy method to evaluate the influence of root surface roughness.