Oral B Cross Action Electric Toothbrush Replacement Brush Heads Refill, 4CountThe new cross Action brush head with bacterial protection bristles is our most advanced replacement brush and prevents bacterial growth on the bristles. The blue Indicator Bristles indicate when to change the brush head Brand quality From Oral B the number 1 toothbrush brand that dentists recommend the most frequently in the world Fits ALL Oral B electric toothbrushes except Pulsonic Box contents: 4 Oral B cross Action toothbrush heads with bacterial