The Oral-B Precision Clean X-Filament Replacement Brush Heads advanced filament technology design was created to brush away plaque. This replacement brush head provides up to 400% more plaque removal along the gum line* to give you a complete clean you can feel. Oral-B's Precision Clean Replacement Brush Head with X-Filament technology is an ideal addition to your brushing routine by providing advanced cleaning. This dentist-inspired round brush head gives a tooth-by-tooth clean with specially engineered bristles to ensure optimal coverage on every tooth and remove plaque buildup stuck on the gumline. The replacement brush heads have 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. This replacement brush head pack includes four genuine Oral-B Precision Clean Replacement Brush Heads with X-Filament bristles. The Oral-B Precision Clean 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 brush head becomes worn. Oral-B: Trust the 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.