Children's bamboo toothbrush The junior bamboo toothbrush has natural, extra soft, straight-trimmed bamboo-based bristles for the gentle and efficient cleaning of young teeth and gums.  Vegan friendly, eco friendly, biodegradable and phthalate free. MATERIALS The bristles are made from bamboo dust mixed with nylon 4 - approximately 90% bamboo, 10% nylon. Nylon 4 is a BPA and phthalate-free, naturally biodegradable polyamide. Packaged in a biodegradable, recycled Kraft card box.