Cleans Where Floss Will Not Reach! Dr. Milners 4 in 1 Sonic Clean Between Machine is the ideal everyday oral hygiene solution. Prevent tooth decay, gum disease and bad breath with sonic power! More than a great sonic toothbrush, the Clean Between Machine, All-in-one cleaning system reaches between teeth, removes plaque, polishes & whitens, massages gums and fights bad breath. Cleans your mouth with 4 attachments (Sonic head toothbrush, tongue cleaner, gum massager stimulator, interdental flossing head) and 8 interdental brushes that reach in-between teeth!. Battery operated sonic brush handle oscillates back and forth at 7500 motions per minute. These motions create sonic waves that gently clean your teeth, gums and tongue leaving your mouth healthy and clean. Requires 2 AA batteries (not included).