The Oral-B CrossAction Replacement Electric Toothbrush Head is Oral-B's most advanced technology. It features perfectly angled bristles to remove 100% more plaque for a superior clean**. The round brush head is inspired by dental professional tools for a tooth-by-tooth clean, with specially engineered bristles. Additionally, the Bacteria Guard Bristles help keep your brush clean for up to 3 months by inhibiting microbial growth that may affect the bristles. The bristles do not kill bacteria in the mouth or protect you against disease. Always clean the product thoroughly after use. Compatible with the entire lineup of Oral-B powered by Braun rechargeable electric toothbrushes excluding Pulsonic, Sonic Complete and Vitality Sonic models. **vs. a regular manual toothbrush when used on Pro1000 and up handles