Gold -Half of the Nano-b Charcoal & Gold bristles are impregnated with genuine gold particles to safeguard your toothbrush from bacteria. This keeps your toothbrush clean and safe, which is what you want from a dental tool you put in your mouth every day. Charcoal - The other half of the bristles are impregnated with bamboo charcoal particles. Known for its natural whitening and toxin absorbing qualities, charcoal helps your teeth stay clean and white. Double bristle structure - Unique bristle structure combines brushing and flossing in one, removing plaque effectively even between your teeth and under the gum line. 800 long, ultra-thin bristles imitate flossing action to clean plaque in hard-to-reach places, while 800 short bristles take care of the big surfaces of your teeth. Rounded bristle tips - Scientifically rounded bristle tips protect the soft tissue of your mouth from scratches and cuts. This makes Nano-b ideal for people suffering from sensitive or bleeding gums. Small head size - A toothbrush should be able to effectively clean all of your teeth, not just the easy-to-reach ones. We've made the head of Nano-b small and nimble enough to reach and clean your back teeth just as well. Travel case included - Each Nano-b toothbrush comes in its own handy travel case, ideal for storage and travel. Now it's easy to take your toothbrush with you wherever life takes you. Lasts up to 6 months - The Nano-b bristles are more durable and fray less than standard brushes. Combined with the antibacterial features, this means you can safely use your Nano-b brush for up to 6 months.