Ecoluxe Kids Bamboo Toothbrush with Replaceable Bristles. Reusable, replaceable bristle manual made of castor bean oil. No batteries, no electricity required and travel ready anytime. These eco-friendly bamboo toothbrushes are ideal for packing on road trips and adventures. Our toothbrush bristles are not only available in various shapes, but also in 2 sizes, adults and kids. Adult's replaceable bristles have a larger surface area than the kid's toothbrush. Easily screw off and install the new bristles, remove the bristles and recycle the plant-based bristles. Purchase the 4 pack replacement bristles for kids' toothbrush in 4 different shapes at the Ecoluxe Store.