Oral-B CrossAction X Replacement Brush Heads (10 Count) The Oral-B CrossAction X filaments replacement brush head contains clinically proven technologies to deliver a superior clean vs. a regular manual toothbrush. 6X More Plaque Removal versus a regular manual toothbrush. The professionally inspired design of the CrossAction brush head surrounds each tooth with bristles angled at 16 degrees and 3D cleaning action oscillates rotates and pulsates to break up and remove more plaque along the gumline vs a regular manual toothbrush. Max Clean Bristles indicate time to change. Round brush head is inspired by dental professional tools for a tooth-by-tooth clean with specially engineered bristles. The X shaped bristles lift trap and remove plaque for that all around fresh clean. The Oral-B Brush heads are compatible with Oral-B rechargeable toothbrushes except for Oral-B iO Toothbrushes.