Select options Grants of Australia Adult Bamboo Toothbrush – Medium $4.50 Grant’s biodegradable bamboo toothbrush is an eco-friendly way to brush your teeth. Handles are made from 100% biodegradable and environmentally sustainable bamboo. The bristles are made from nylon which aren’t compostable but can be recycled. Break off the bristle head or remove the bristles with pliers and recycle as per your local recycling facility guidelines. The bare bamboo handle can then be composted and will safely return to the soil.