The bristles we use are made of BPA free nylon 6. Although it is not biodegradable it is still the best choice to maintain proper oral care. Nylon 6 is a low water absorbent that keeps your toothbrush hygienic and keeps your teeth clean. There are bio alternatives like animal hair or PLA bristles, but to proper oral care standards, they aren’t yet a good alternative and also we are not keen on using any animal by-products. We are constantly monitoring the market and as soon as there will be a better biodegradable alternative we will make sure to implement it in our toothbrushes.