Long outer bristles for effective and efficient plaque removal along the gum line. Short inner bristles for effective plaque removal from the surface of teeth. Bi-level bristles. Polished, end-rounded bristles for safe, comfortable, and effective cleaning. Angled neck to clean hard to reach areas. Anti-slip thumb-rest on front and back of the handle for excellent comfort and control. 100% satisfaction guaranteed! If you're not satisfied with this product for any reason, please call us so we can make you 100% satisfied. Made in China.