Most toothbrushes are made from polypropylene and nylon: two types of plastic that shed microfibers, can't be recycled, and last hundreds of years in a landfill - and who knows how long in your body... This one is different. The handle is bamboo, one of the fastest-growing plants on earth. The bristles are boar hair, a natural fiber that works as well as nylon and breaks down completely. Fully biodegradable and compostable. Heads up, the boar hair bristles do run on the stiffer side, so keep that in mind when purchasing. If you are looking for a softer bristle, check out the Canary Bamboo Toothbrush, also listed on Unslop.