The toothbrush handle is made of Moso bamboo which has grown for more than 3 years. These selected materials have gone through high-temperature carbonization. Bamboo can be more durable, and less susceptible to mildew, with no bleaching, no added preservatives, and with this SGS detection, there is no chemical addition, and it keeps the natural primary color texture of the bamboo. We do not use any chemical coating. We use the EPnS water-based wood coating as a waterproof and mildew-proof coating to enhance the durability and the antibacterial property.