About 90 percent of Iowa’s population receives water that has been treated with fluoride. But what is it? What does it do? And why do some cities not treat their water?
MASS COMMUNICATION SPECIALIST SEAMAN CHRISTOPHER THOMAS / U.S. NAVY / 2021 Capt. Randall Harmeyer, Joint Base Pearl Harbor-Hickam public works officer, inspects water flushed through granulated ...