Feather:Replacement toothbrush heads fit with all electric toothbrush handles, except for Oral-B Sonic, Pulsonic and iO seriesEnd-rounded Bristles: For our bristles, we've used the most advanced top-rounded technology. The protruding bristles on the upper, middle and decrease parts of the brush undergo the 1st rounding process; then the concave part is rounded for the second time to make sure that each bunch of bristles meet the standard. The multi-process is only to higher protect your teeth and oral health and Safety: Our brush heads, the bristles with bacterial holding function, which might forestall bacterial advancement on the brush recommend replacing the top off every single three monthsDurable Bristles: In order to assure the durability of the brush, we undertake high-end bristle implantation technology, which makes the bristles more durable and not clean to fall off. You will get a premium brushing experience: Compatible with most Oral-B Electric Toothbrush handles, aside from Oral-B Sonic,Pulsonic and iO seriesCompatible with the Following Oral B Electric Toothbrushes:Oral b Pro 1 600/ 650/670,Pro 2 2000/2500/2900,Pro three 3000/3500/3900Oral b Smart 4 4000N/4900N/5 5000/6 6000N/6500/7 7000NOral b Genius X 8900/9000/20000N/4 4000WOral b Vitality 100/3D White/Plus/CrossActionOral b Teen series(All Models)Oral b Junior kidsOral B Advance Power 400 BatteryOral B Triumph (All Models)Oral B 3-d Excel (All models)Oral B Plak Control 3-D | Duo | Travel