Four-year-old Marley Gilliam (center) and his fellow Child Development Center classmates examine a model of unhealthy teeth during the National Children’s Dental Health Month dental hygiene lesson put on by base dental professionals in the CDC at Ellsworth Air Force Base, S.D., Feb. 13, 2013. Staff used teeth displays to show the children what healthy and unhealthy teeth look like, and proper dental health care habits. (U.S. Air Force photo by Airman 1st Class Anania Tekurio/Released)