Interprox Plus Micro Interdental brushes 1.1mm x6 Interprox Plus micro is designed to remove biofilm (bacterial plaque) from interdental spaces of 0.9 mm. * The dimensions of the cylindrical head allow for a minimum interdental space of 0.9 mm (PHD = 0.9) The angled head of the Interprox Plus microbrush allows perpendicular insertion into the interdental spaces of molars and premolars. This specific shape allows perpendicular insertion, avoiding injuring the gums. The size of the head guarantees a deep cleaning of the interdental spaces of at least 0.9 mm. The brush also comes with a protective cap to make it easier to transport.