Say goodbye to your toxic plastic toothbrush and hello to the PRIMALS Boar Bristle & Bamboo Toothbrush. What\'s so bad about plastic toothbrushes? Plastic toothbrushes are made with nylon bristles and of course a plastic handle. Both plastic and nylon are derived from petroleum and contain BPA, phthalates, PFAS and many other carcinogenic and horm..