The Oral-B CrossAction replacement brush head with antibacterial bristles is our most advanced brush head and prevents bacterial growth on the bristles. It cleans 100% better than a conventional manual toothbrush, while the antibacterial bristles help keep your brush head clean. The bristles contain silver-zinc zeolite to inhibit bacterial growth on the brush. They do not have antibacterial effects in the mouth and do not protect against diseases. The perfectly angled bristles reach deep between teeth to remove plaque. The blue indicator bristles signal when you should replace the brush head. The replacement brush head is compatible with all Oral-B electric toothbrushes, except for Oral-B Pulsonic. The package includes 10 Oral-B CrossAction replacement brush heads with antibacterial protection.