Tight spaces are the easiest places for plaque to build up--and the toughest to clean, since straight-bristle toothbrushes struggle to reach them. But CrossAction Pro-Health CrissCross bristles attack plaque from the perfect angle--an optimal 16°--cleaning better than straight ones. Plus, Pro-Health's tongue cleaner helps remove germs from the tongue.; Crisscross bristles: Angled in opposing directions to lift out and sweep away plaque; Soft gum stimulators: Positioned in in two rows in opposing directions and are designed to flex and then straighten, actively penetrating between the teeth and along the gum line; Textured tongue cleaner: Located on the back of the brush Power Tip bristles: Extra long to help clean between teeth in hard-to-reach places; Dense elliptical-shaped surface-cleaning tufts: Oblong shape designed to help clean the surface area of the tooth; Carefully polished end-round bristles: Gentle on teeth and gums.