DES 1840 - Preventive Dentistry DES 1840 - Preventive Dentistry A study of the periodontal tissues, tooth deposits and stains, caries etiology host, agent, and environmental factors are emphasized, and prevention methods are learned. Floss, brushing methods, and use of dental adjuncts are emphasized. Use of preventive agents such as fluorides are examined. Semester Hours: 2 credit hours Semester pring Fees: None Course Designations: AS only