Radius is an ergonomically designed toothbrush that was created based on applied ergonomics principles. It was designed with consideration for human factors, the size and alignment of the bristle head and bristles, a mid-thumb resting area for gripping, a palm grip on the bottom to reduce slippage, and to be usable by both left and right handed people. The design was developed after considering factors from human testing and the ADA to create a brush optimized for dental hygiene.