Interdental brush suited for removing interdental plaque.Plaque removal rate is improved to 95% by combination use with toothbrush.Just brushing by toothbrush, whereas clean only 58% of the plaque between the teeth, the interdental brush and toothbrush are able to remove plaque up to 95%.The standards set for the wire endurance test (90 degree bending test that put a 500g weight on the brush) for the I shape is 1,000 times, L shape is 500 times ( ISO standard is 20 times ). Using thin bristles for the front and thicker ones for the rear end of the brush makes it easier for insertion between teeth and more gentle when brushing the gums (except for size 0 and 1).Developed 7 different sizes for I shape in order to match the conditions of your teeth and gums.Product Size:0(SSSS) - 0.6mm1(SSS) - 0.7mm2(SS) - 0.8mm3(S) - 1mm4(M) - 1.2mm5(L) - 1.5mm6(LL) - 1.9mm