From the recycled rubber handle the to vegetable-based nylon bristles, the Radius Flex Brush is eco-friendly from top to bottom. The design of the Big Brush with a twist, made from flexible recycled rubber with a soft head stems, the angled neck reduces pressure on gums and teeth - especially if you're a hard brusher. With 3x the normal toothbrush's bristles, the wide oval brush head coupled with a flexible neck helps target those tricky-to-reach areas and massages the whole mouth as it goes for an all-over tingly clean, that lasts 3x longer than other run-of-the-mill toothbrushes.