58-39-8. Contracts with subscribers--Rates charged for services--Approval by director. Any dental service corporation organized under the provisions of this chapter may enter into contracts with subscribers to furnish dental service through dentists. The rates charged by any such corporation to the subscriber for dental service and the contracts by said corporation with the subscribers for dental service shall at all times be subject to the approval of the director. The contracts by any such corporation with the subscribers for dental service shall be entered into only with dentists regularly licensed to practice their profession by the State of South Dakota. All contracts issued by such corporation to the subscribers shall constitute direct obligations of the corporation and of the dentists with whom such corporation has contracted for dental service.