Duane C. Keller, DMD, FAGD, graduated from Washington University School of Dental Medicine in 1976 and has maintained a full-time private practice in St. Louis, Missouri, ever since. He has published more than 35 articles in professional journals and lectured to national and international offices for more than 20 years. Dr. Keller currently serves as the president and chief scientific officer of Perio Protect, LLC.