Ultra soft toothbrush for gentle cleaning The toothbrush is gentle on teeth and gums thanks to the fine Curen filaments, which have a diameter of just 0.1 mm. Unlike conventional toothbrushes, the bristles are not made of nylon, but of 5460 closely spaced Curen filaments, which enable efficient cleaning of teeth, gums and the gum line (sulcus). The angled head of the toothbrush makes it easy to reach all areas of the mouth, while the octagonal handle helps you brush at the right angle.