Toothbrush Replacement Head Fit for Crossaction--Cross bristles design to clean teeth deeply. The 16 degree angled bristles help clean all areas of the teeth thoroughly.It designs for people who need deep cleaning of teeth. Continuous use of the toothbrush head can effectively remove plaque. Soft bristles protect your gums.A strict QC to make sure our brushes work properly. Our products are subjected to a series of rigorous sampling tests, such as Tensile test: Avoiding the shedding of bristle, Simulation test of mouth: Guarantee durability of the brush head.Replacement toothbrush heads are ALL made with End-rounded Dupont Tynex Bristles, which recognize as the apex of quality in the oral care synthetic filament industry.Compatible with most Oral B Braun rechargeable toothbrushes, Except for Oral-B Sonic toothbrushes. Do not compatible With Oral-B iO Series.