This clinical case by Craig A. Long, DDS, demonstrates the efficacy of the LANAP protocol in treating periodontal disease in a patient with diabetes mellitus. It also demonstrates the correlation between uncontrolled DM and its effect on chronic adult periodontitis. The patient’s HbA1c levels and periodontal health exhibited marked improvement after LANAP treatment. Dr. Long describes the advantage of using the PerioLase MVP-7 digitally pulsed Nd:YAG dental laser in treating diabetic patients with Type IV periodontitis with the LANAP protocol.