Three Options Medium, Hard or Extra Hard. Tilted Planting of Bristles Whether brushing forward or backward, will result in a set of reverse-brushed bristles, increasing the ability to remove dirt. Beneficial for removing smoke stains and tooth stains, brightening teeth, and refreshing breath. End-Rounded Bristles Stain removal without harming teeth, protecting enamel. Designed for effective cleaning and comfort. Built in Tongue Cleaner Freshen your mouth, giving you confidence in life Non-slip Sturdy Handle High-quality soft rubber, comfortable feel, fits fingers, easy to grip and control