The Oral-B Precision Clean X-Filament Electric Toothbrush Replacement Heads 2-count features advanced filament technology design created to brush away plaque. This electric toothbrush replacement head provides up to 400% more plaque removal along the gum line*. This dentist-inspired round electric toothbrush head has specially engineered bristles to ensure optimal coverage on every tooth and remove plaque buildup stuck on the gumline. The replacement toothbrush heads have indicator bristles that signal when it is time to replace your brush head. These replacement toothbrush 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 brush head becomes worn. Oral-B: Trust the toothbrush brand dentists use the most worldwide.** *Vs. a regular manual toothbrush. **Based on surveys of a representative worldwide sample of dentists carried out for P&G regularly.