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