As gentle on your mouth as they are on the planet, these brushes are made with 100% bamboo handles and BPA-free soft nylon bristles. In fact, the bristles are made with 35% castor bean oil, which means less carbon used in manufacturing. They’re wrapped in fully biodegradable/compostable packaging made from wood and cotton pulp. These naturally anti-bacterial and anti-microbial brushes are also available for kids!