The Oral-B Series Interdental Clean toothbrushes have an innovative, dentist-made bristle pattern. The focused design of the high beer density promotes efficient access and cleanse of hard -to -reach areas. The external bristles have decided inwardly to support higher -centered bristles, allowing targeted access to special attention - whether it is orthodontist, dental implants or other hard -to -reach areas requiring increased care. Ideal for those with special oral hygiene needs who want to avoid plaque complications. Oral-B interdental Clean toothbrushes were designed specifically for Oral-B IO electric toothbrushes. Since dentists recommend replacing toothbrushes every 3 months for the best result, Oral-B replacement heads have color-changing bristles, which are white fading when the time has come. Enjoy the outstanding cleaning effect with the only spare head designed specifically designed for the Oral-B IO electric toothbrush and guaranteed to fit it!