The thickness of a hair of ordinary toothbrush is about 0.15-0.10 mm, therefore, it has the limit to brush the narrow space of 0.005-0.10 mm in between the teethridge. However, with this specially processed microscopic (fine) hair could brush the corner of the teethridge (gum), thickness of 0.03mm below as well as in between tooth and tooth more cleanly.
Upper-side Hair (fine and soft hair) It has an excellent plag removal function to the minute narrow space including gum and teeth, tooth and tooth, surface of the molar tooth, it could make an effect of gum massage as well.
Lower-side Hair (rounded ordinary hair) It has a function to brush the surfaces of teeth neatly and really lifts one's spirits.