Oral-B Pro Cross Action Electric Toothbrush Replacement Heads are one of the most advanced replacement heads for Oral-B toothbrushes. Oral-B Pro Cross Action tips with CleanMaximiser technology Oral-B's improved CrossAction toothbrush heads feature CleanMaximiser technology, which changes the color of the bristles from green to yellow, ensuring optimal head performance and excellent brushing results. Thanks to the proper arrangement of the fibers, the head of the Oral-B Pro Cross Action electric toothbrush precisely surrounds each tooth. It easily reaches hard-to-reach interdental spaces, and the rounded tips of the fibers protect the gums.