Declarative Title The randomized controlled trial (RCT) published by the Journal of the American Medical Association (JAMA) on the impact of periodontal therapy on glycated hemoglobin (HbA1c) has fundamental flaws. Article Title and Bibliographic Information The effect of nonsurgical periodontal therapy on hemoglobin A1c levels in persons with type 2 diabetes and chronic periodontitis: A randomized clinical trial. Engebretson SP, Hyman LG, Michalowicz BS, Schoenfeld ER, Gelato MC, Hou W, et al. (16 authors). JAMA 2013;310(23):2523-32. Purpose/Question Does nonsurgical periodontal treatment reduce levels of HbA1c in persons with type 2 diabetes and moderate to advanced chronic periodontitis? Source of Funding US Government -- National Institute of Dental and Craniofacial Research, National Institutes of Health: Cooperative agreements ($15.4M): 1) UO1 DE018902 (Dr. Engebretson: $11.1M) and 2) U01 DE018886 (Dr. Hyman: $4.3M) Type of Study/Design Multi-center RCT. Trial Registration: clinicaltrials.gov identifier: NCT00997178.