Dynamic angled power tip designed to access hard-to-reach areas like the very back teeth The first of its kind, the TriZone brush head is divided into three cleaning zones to keep your teeth and gums healthy Non-sweeping bristles pulsate on the entire surface of your teeth to fight plaque build-up Sweeping, pulsating bristles reach deep between teeth for a stimulating brushing experience TriZone brush heads can be used with TriZone, Oral-B Trizone Heads 4 Pack | Living Social