Ultimate Clean combines the perfect angle of Oral-B with innovative new bristles, for the best cleaning of Oral-B. For up to 100% removal of plaque from day 1. Oral-B's signature round brush head has bristles carefully positioned to best encompass each tooth for the best possible clean. Dentists recommend replacing the brush head every 3 months for optimal cleaning. Designed exclusively for and guaranteed to match your Oral-B iO. Contains 4 toothbrush heads.