Short description: Oral-B Pro 3 3900N Double Pack ensures excellent oral health and hygiene for your teeth with two electric toothbrushes in one set. Deep clean and healthier gums with 360º pressure control on the gums, which warns you if you are brushing too hard. 3 brushing modes: daily cleaning, whitening, and sensitive. The built-in timer on the handle alerts you every 30 seconds to change the cleaning zone.