The Oral-B FlossAction Electric Toothbrush Replacement Head White 2-count has an advanced filament technology design that 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 lift trap break up and remove plaque along the gumline. This dentist-inspired round toothbrush head gives a tooth-by-tooth clean with specially engineered bristles to ensure optimal coverage on every tooth. The Oral-B replacement toothbrush head has indicator bristles that signal when it is time to replace your toothbrush head. The Oral-B FlossActionX Replacement Brush Heads are compatible with all Oral-B electric toothbrushes except for Oral-B iO Toothbrushes. Do not use on children under age 3. Replace brush head every three months or sooner if brand head becomes worn. Oral-B: Trust the toothbrush brand dentists use the most worldwide.** *Does not replace flossing. **Based on surveys of a representative worldwide sample of dentists carried out for P&G regularly.