Colgate Slim Soft Charcoal- Deep Cleaning, yet gentle. - Binchotan slim tip bristles <0.01mm.* specially designed to sweep away food and plaque from along the gum line and narrow gaps between teeth. - Bristles infused with silver ion inhibits bacteria build up on bristles.** - All black binchotan charcoal bristle tip <0.01mm.* *Diameter of the bristle tip is less than 0.01mm. **The bristles do not kill bacteria in your mouth or protect you against disease. Always clean this product after use.