A hairbrush is a stick brush with rigid or soft bristles used in hair care for smoothing, styling, and detangling human hair, or for grooming an animal`s fur. It can also be used for styling with a curling iron or blowdryer. == United States history== The earliest U.S. patent for a modern hairbrush was by Hugh Rock in 1854. A brush with elastic w.... Found on http://en.wikipedia.org/wiki/Hairbrush