This is the electric toothbrush that thoroughly cleans all of your teeth in 30 seconds, reducing necessary brushing time by 75%. Unlike typical toothbrushes that only clean one surface at a time, this advanced model has four heads that clean six surfaces--the front, back, and chewing surface of top and bottom teeth--simultaneously. The electric toothbrush automatically executes the Bass technique, a brushing method recommended by the American Dental Association: the bristles are aligned at a 45º angle and move towards and away from the gums 810 times per minute to remove bacterial plaque from teeth and gums. The pivoting heads self-adjust to accommodate narrower front teeth and broader back teeth and the bristles have varying lengths to clean prominent tooth surfaces and hard-to-reach spaces. Two included rechargeable AA batteries provide up to 60 uses after a 12-hour charge. Charger plugs into AC. Includes four soft bristle brush heads and a tongue cleaner. 7 1/2" L x 1 1/4" W x 1" D. (3 1/2 oz.)