Surround design. 3 X bacteria removal action (removes bacteria in 3 ways). For a healthier whole mouth clean (vs a flat-trim toothbrush)! 1. Surround bristles simultaneously clean both sides of the teeth, and reach down to the gumline. 2. Wraparound cleaner. 3. Cheek and tongue cleaner. Dentists & hygienists recommend: flossing daily; brushing at least twice a day; replacing your toothbrush every 3 months; cleaning your tongue to remove bacteria. Turning off your water while brushing your teeth can save up to 4 gallons of water each time you brush! Made in Switzerland.