The Oral-B Precision Clean replacement toothbrush head provides up to 400% more plaque removal along the gum line*. The round brush head is inspired by dental professional tools for a tooth-by-tooth clean with specially engineered soft bristles. Indicator bristles signal time to replace brush head. Dentists recommend changing your brush head every 3 months. For adults and children 3+. *vs. a regular manual toothbrush