As one of Oral-B's premium refill brush heads, the CrossAction brush head has 16 degrees of perfectly angled bristles to attack plaque and remove up to 100% more plaque compared to a standard manual toothbrush Oral-B's improved CrossAction toothbrush heads are developed with CleanMaximiser technology that causes the bristles to change color from green to yellow when it's time to replace the brush head for optimal brush head performance and the best possible cleaning. The unique bristles reach deep between the teeth to remove plaque and make your entire mouth cleaner than with a regular manual toothbrush. Fits all Oral-B handles, except Pulsonic and iO. • With CleanMaximiser technology that makes the bristles change color from green to yellow when it's time to replace the brush head • Removes up to 100% more plaque for healthier gums compared to a regular manual toothbrush • Oral-B's best for cleaning the whole mouth (except Oral-B iO)< br /> • Perfectly angled 16 degrees to reach deep between teeth and sweep away plaque • Fits all Oral-B handles, except Pulsonic and iO