Chracoal Infused Soft Bristles Bamboo Handle Ergonomic Eco-Friendly 3 toothbrushes with a ergonomic bamboo handle and charcoal infused soft bristles. Activated charcoal helps to whiten teeth and remove stains. Handle is made of MOS bamboo, an environmentally sustainable timber. The bamboo handle has been heat treated to make it water resistant and give it a nice finish.