The bristles of Ecopify Bamboo Toothbrush are made from Nylon. It is not plastic-free, but it can be 100% recyclable. Reason: Nylon is used for the bristles in about 99% of all toothbrushes in the market right now (including plastic and bamboo toothbrush) because they are stronger, more durable, and more effective at cleaning your teeth than animal-hair or plant-based bristles.