Senior Airman Taylor Johnson, 28th Medical Operations Squadron dental assistant journeyman, uses an ultra-sonic cavitron on Staff Sgt. Andy Weaver, 28th Communications Squadron client service technician, during an annual cleaning in the dental clinic at Ellsworth Air Force Base, S.D., Feb. 7, 2012. The tool uses air and water to remove hard deposits and flush away plaque to ensure oral hygiene, keeping airmen healthy and fit to fight.