The Oral-B iO Ultimate Clean replacement electric toothbrush heads are designed for an effective clean, providing up to 100% plaque removal from day one. They combine Oral-B's signature round brush head with innovative bristles meticulously arranged to surround each tooth for the best possible clean. Dentists recommend changing your brush head every 3 months for optimal performance. These heads are designed exclusively for and guaranteed to fit Oral-B iO electric toothbrushes. This pack includes 2 toothbrush heads. Oral-B is the #1 dentist-recommended toothbrush brand worldwide. Features color-changing bristles to indicate when replacement is needed. Effectively and gently removes up to 100% more plaque than a regular manual toothbrush along the gum line.