SlimSoft Advanced Gold Charcoal has individual dual core bristles which have a strong base and <,0.01mm^ ultra soft slim tips Clinically proven to make gums 300% healthier* Anti-bacterial dual core bristles can inhibit up to 99% of bacteria on bristles** ^Diameter of bristle tip is less than 0.01mm *vs. ordinary flat trim toothbrush **the bristles do not kill bacteria in your mouth or protect you against disease. Always clean this product after use.