Toothbrushes Pro Interdental, Duo Soft, Trisa The professional toothbrush, developed and produced in Switzerland. Revolutionary model that radically changes everyones perception of brushing. It becomes pleasant, really effective and any other brush used afterwards will be perceived as much inferior. The innovative layered filament system allows simultaneous cleaning of the interdental space (long, very thin filaments) and the flat surfaces of the tooth (short filaments). Doctors advice: brush gently, vertically. Change your toothbrush every 2-3 months. Soft bristles Im average The picture is suggestive, the colors of the brushes may vary.