Colgate SlimSoft Flex Clean Toothbrush is the next generation macro molecular ultra thin bristles for deeper cleaning along gum line and in between teeth! With macro molecular toothbrush bristle material, the bristles are 2 times more flexible and it gently cares for gums . Colgate SlimSoft Flex Clean Charcoal Toothbrush also has the thinnest + compact head of only 0.3cm to clean areas that are difficult to reach and help remove bacteria in mouth.