Oral-B UltraThin Black Tea Gum Care Toothbrush has individually tapered bristles that are infused with essence of black tea, providing a soothing, gentle and deep clean that improves your gum health in 14 days. Unlike most thin toothbrushes in the market, Oral-B UltraThin Black Tea Gum Care has bristles that are individually tapered at the tips, to gently clean between teeth and below the gum line. - Made with real black tea essence within the bristle. - 2 times more flexible bristle tips vs regular brushes. - UltraThin bristles reach up to 2 times deeper between teeth vs regular, flat trim bristles. - Based on laboratory testing.