Inclusion Criteria:  All the patients of age 18-40 years at least 20 teeth in their mouth and not including wisdom teeth.  The patients of either gender. The patients with active and untreated carious lesions, (at least one carious tooth should be present in patient oral cavity).  -  Exclusion Criteria:  The patients undergoing orthodontic treatment The patients already taking antibiotic therapy or antimicrobial rinse. The patients having allergy to chlorhexidine mouthwash The patients whose consents could not be obtained  -