Compared to a manual toothbrush, it can remove up to 100% more bacterial plaque from difficult-to-reach places, leaving teeth and gums cleaner. For thorough cleaning, Oral-B CrossAction's special 16° angled bristles precisely fit each tooth. Except for pulsonic and iO toothbrushes, Oral-B electric rechargeable toothbrushes are compatible. Indicator for brush head replacement: bristles turn from green to yellow depending on usage, alerting you when to replace to maintain 100% cleaning effectiveness. Eight authentic Oral-B Cross Action round brush heads are included in the pack. Only genuine Oral-B brush heads are made to ensure a 100% fit with your Oral-B toothbrush and the best cleaning results for up to 160+ brushing sessions. The most popular brand among dentists worldwide is Oral-B. Results that have been clinically proven