These interdental brushes by Hydrophil feature a plastic-free bamboo handle, and are an environmentally friendly complement to your daily dental care. They allow you to clean the hard-to-get-at spaces between your teeth. You can choose from a selection of four ISO standard sizes. Size 1 has the smallest bristles, at 0.45 mm. Using the interdental brush together with a bamboo or wooden toothbrush, you not only protect your teeth and gums but at the same time, you protect the environment too. Like all Hydrophil products, these Interdental Brushes are water-neutral, vegan and fair trade. How to usePush the interdental brush carefully into the space between two teeth. Move the brush horizontally back and forth a few times as well as diagonally in an “X” movement alongside the teeth. Do this carefully. Always use the interdental brush without toothpaste, and preferably daily before brushing your teeth. Clean the brush under running water. You should replace the brush after 7 to 14 days. DisposalPlease be aware that bristles are still BPA-free nylon so these must be removed before putting the handle in your compost bin. Materials: 100% bamboo handle, metal wire and BPA-free nylon bristles.