181001-Z-HI039-1021
Dr. Nicole Yingling, endodontist and owner of Mason-Dixon Endodontics, Chambersburg, Pennsylvania, examines a patient’s mouth for the reason that they are having mouth pain Oct. 1, 2018. Yingling began her career as a general dentist and later specialized in endodontics, which focuses on the treatment of root canals. Yingling served 11 years as an active duty dentist and after a 12-year break-in-service, enlisted into the 193rd Special Operations Medical Group, Middletown, Pennsylvania. (U.S. Air National Guard photo by Senior Airman Julia Sorber/Released)