The Oral-B FlossAction Replacement Electric Toothbrush Head provides a floss-like clean** for healthier gums. The round brush head is inspired by dental professional tools for a tooth-by-tooth clean, with specially engineered bristles. The FlossAction toothbrush head has unique floss action bristles to loosen plaque. Additionally, the Bacteria Guard Bristles help keep your brush clean for up to 3 months*. *inhibits 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. **when used on Pro 2000 and up handle. Does not replace flossing.