Headquartered in Pierre, S.D., Delta Dental of South Dakota is a nonprofit corporation that has been providing dental insurance plans for customers since 1963. It works to improve oral health by emphasizing preventive care and making dental coverage for a variety of employers, groups and individuals. The corporation offers quality assurance and claims programs to help control costs for both employers and employees. It offers an online tool that enables clientsto review information related to claims and benefit plans. Delta Dental of South Dakota is a member of the Delta Dental Plans Association, which is one of the largest dental plan systems in the United States. Its member companies provide coverage for more than 50 million people in over 88,000 groups nationwide.