As one of Oral-B's top replacement brush heads, CrossAction features bristles angled at exactly 16 degrees and fights plaque, removing up to 100% more plaque than a regular manual toothbrush. The uniquely designed bristles reach deep between the teeth to remove plaque and leave the entire oral cavity cleaner than a simple manual toothbrush. Oral-B's improved CrossAction brush heads are developed with CleanMaximiser technology that turns green bristles yellow when it's time to change the brush head for optimal performance.