Oral-B Pro-Expert Anti Plaque manual toothbrush is designed to reduce up to 90% plaque in hard-to-reach areas, based on a single use clinical study, to give you a clean and healthy smile. Its flexing CrissCross bristles lift and sweep away plaque from an optimal angle.Reduces up to 90% plaque in hard-to-reach areas_x000D_ 16 degree angled CrissCross bristles to penetrate hard-to-reach plaque in-between teeth_x000D_ Power Tip Bristles help reach deep and clean hard-to-reach areas_x000D_ Gentle on enamel_x000D_ Superior clean vs. a regular manual toothbrush_x000D_ Medium toothbrush_x000D_ Oral-B, #1 toothbrush brand used by dentists worldwideDentists recommend replacing your toothbrush every 3 months, or when bristles are faded and worn, for a better cleanNot intended for children 3 years and under.