Max Clean Bristles: Max Clean Bristles Change From Green To Yellow When Itã¢ÂS Time To Replace Your Toothbrush Multi-Level Bristles For A Deep Clean Power Tip Bristles Are Extra Long To Help Clean Hard To Reach Places Outer Angled Bristles Gently Massage Your Gums And Help Clean Along The Gum Line Oral-B Is The #1 Dentist-Recommended Toothbrush Brand Worldwide With Power Tip Bristles Designed To Reach Deep And Help Clean Hard-To-Reach Places, The Oral-B Bacteria Blast Toothbrush Removes Significantly More Plaque Than A Regular Manual Brush. It Features Longer Gum-Massaging Bristles That Gently Clean And Stimulate The Gum Line. Bacteria Blastsã¢ÂS Max Clean Bristles Change From Green To Yellow When Itã¢ÂS Time To Replace Your Toothbrush As Suggested By The American Dental Association