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In poor areas, hostile environment promotes the growth of bacteria. To them, regularly replace toothbrush is unrealistic. But no place is more dirty than the bottom of bristles. To keep healthy, bristles must get thoroughly clean to increase of service life. l’ ll make two sides of toothbrush head plump, then certain air will be there. After extruding, the toothbrush head will be easily spread and bristles will be exploded. Hereafter, you can swash the bottom of bristles thoroughly. At the same time, bristles can be easily dry, avoiding the case of the bristles keep wet.
East China Normal University