Utilization of dental services by 30 diabetic and 30 nondiabetic subjects was assessed by longitudinal monitoring over a period of 3 years. All subjects were examined clinically three times, and their treatment consisted mainly of cariologic and periodontal treatment. The treatment was delivered by a dentist and an expanded-duty dental hygienist. The study groups were similar with regard to the total number of dental visits needed. However, the treatment of diabetic subjects was more demanding in that more dentist's workload was needed for the diabetic group. They also missed more appointments without cancellation and therefore more office time had to be reserved for them.