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Advanced Bristle System for Superior Clean - Genkent brush head is designed with precise angled bristles that can reach deep between teeth cleaning around and remove more plaque along the gum line and in between teeth than a manual toothbrush. Electric Toothbrush Replacement Heads Compatible with Oral B(12 20 or 32 Pack) White 12 Pack Dimensions: 0.78 inches (H) x 4.