No. The bristles are made from Dupont Tynex nylon – one of the industry’s highest quality bristle materials. At WooBamboo, we’ve done an incredible amount of testing, and have found that claimed “biodegradable bristles” either AREN’T, or if they are they actually start to decompose in your mouth with just a week or two of use. Another alternative would be to use boar hair. Yuck. Instead, we decided to get the BEST POSSIBLE BRISTLE for your mouth, and the BEST POSSIBLE HANDLE for the Earth. We’re Dentist Approved, Mother Nature Recommended. 🙂