Zero Waste Bamboo Toothbrush - 100% biodegradable. We are so excited to offer this toothbrush as part of our efforts to eliminate waste! Most bamboo toothbrushes still have nylon bristles, but with ours, even the bristles are completely biodegradable - made from Bamboo Silk with Charcoal. What is bamboo silk? It is a plant based bio-plastic (plastic only made from plants) which is 100% biodegradable. Available for just $2 each - with a suggested retail of $5 this is sure to be a successful addition to your plastic free offerings!