The unique Precision Clean bristles brush away plaque for a superior tooth-by-tooth clean than with a regular manual toothbrush. Oral-B’s improved Precision Clean toothbrush heads are developed with Clean Maximizer technology that turns green bristles yellow for optimal brush head performance and the best clean. Compatible with all Oral-B handles except Pulsonic & iO. Removes up to 100% more bacterial plaque in hard-to-reach areas for cleaner teeth and healthier gums vs. a manual toothbrush, Oral-B Precision Clean features 3 types of bristles size for precise clean, Compatible with Oral-B electric rechargeable toothbrushes at exception of Pulsonic & iO toothbrushes, Brush head replacement indicator: bristles go from green to yellow based on individual usages reminding you when to change to keep 100% cleaning efficacy, Only genuine Oral-B brush heads are designed to guarantee 100% fit with your Oral-B toothbrush and best cleaning efficacy up to 160+ brushing sessions, Pack includes 8 genuine Oral-B Precision Clean round brush heads, Oral-B is #1 brand most used by dentists worldwide. Clinically proven results.