The present invention relates to a dental cleanser composition for improving adhesion to teeth, and more particularly to, a dental cleanser composition which functions to remove not only a smear layer from the dentin surface of an exposed tooth root, but also oral bacteria, and thus is effective in improving adhesion to teeth in periodontal surgery. The present invention provides a dental cleanser composition containing sodium ethylene diaminotetraacetate and octyl phenol ethoxylate which is a surfactant. Sodium ethylene diaminotetraacetate in the composition functions to remove a smear layer on the tooth root surface and has antibacterial activity, and octyl phenol ethoxylate in the composition functions to lipopolysaccharide. Thus, the composition improves adhesion to teeth in periodontal surgery.