6 pack Adult Bamboo tooth brush individually boxed!! 100% biodegradable Soft bristled bamboo toothbrushes are not only dentist-approved, but also Mother Nature recommended. Adult Soft Bristle Brush. The bristles are made of Nylon and the handle is made of Moso bamboo, which is 100% biodegradable. It will completely decompose when tossed after use. Or, it can be composted after pulling out the bristles, Ergonomic handle!!