Oral-B UltraThin Green Tea Toothbrush has individually tapered bristles that are infused with essence of green 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 Green Tea has bristles that are individually tapered at the tips, to gently clean between teeth and below the gum line. Made with real green tea essence within the bristle 2x more flexible bristle tips Vs regular brushes 0.01mm tips Ultrathin bristles reach up to 2x deeper between teeth vs regular, flat trim bristles. Based on laboratory testing. 25mm small head : Effectively cleans molar area.