Were crazy about bamboo, but for some, this doesnt scratch their itch. For them, weve gone to lengths to develop the plant-based Humble Brush that both looks and feels like a regular plastic toothbrush while reducing fossil-based plastic by 45%. The handle is made using wheat starch as a key ingredient, and the bristles are made of high-quality, BPA-free Nylon with 65% plant-based materials from caster beans.