The Oral-B FlossActionX X-Filament Replacement Brush Heads advanced filament technology design was created to brush away plaque. This replacement brush head provides a floss-like clean for healthier gums* with bristles that work to loosen plaque between teeth. Oral-B's FlossActionX Replacement Brush Head with X-Filament bristles is an ideal addition to your brushing routine because the bristles lift, trap, break up, and remove plaque along the gumline, providing an advanced clean. This dentist-inspired round brush head gives a tooth-by-tooth clean with specially engineered bristles to ensure optimal coverage on every tooth. The Oral-B replacement brush head has indicator bristles that signal when it is time to replace your brush head. Round cleans better** and new cleans best. A new replacement brush head removes more plaque than a worn one. The Oral-B FlossActionX replacement brush head pack includes three genuine Oral-B FlossActionX Replacement Brush Heads with X-Filament bristles. The Oral-B FlossActionX Replacement Brush Heads are compatible with all Oral-B rechargeable toothbrushes, except for Oral-B iO Toothbrushes. Oral-B recommends brushing with Crest Toothpaste for optimal results. Do not use on children under age 3. Replace brush head every three months or sooner if brand head becomes worn.