All toothbrushes Curaprox are made of a large number (1560–5460) of extremely thin fibers (Ø 0.18 – 0.12 mm), which even in wet condition retain strength and bind 6 times more water to themselves than ordinary nylon brushes. It's a special polyester fiber called Curen®. Curaprox Soft toothbrush has 1560 fibers. Brushing with such a brush is not only gentler, but at the slightest pressure it adapts to the lines of teeth and gums.