4x extra value pack. Bacteria guard bristles. Help keep your brush clean (Inhabitants microbial growth that may affect the bristles. The bristles do not kill bacteria in the mouth or protect you against disease. Always clean the product thoroughly after use). Advanced cleaning. With bacteria guard. Oral-B, trust the brand more dentists use worldwide. Features: Multi-Level Bristles: Multi-level bristles provide superior gumline cleaning (vs. a regular manual toothbrush). Bacteria Guard Bristles: Bacteria guard bristles help keep your brush clean for up to 3 months (Inhabitants microbial growth that may affect the bristles. The bristles do not kill bacteria in the mouth or protect you against disease. Always clean the product thoroughly after use). PowerTip Bristles: Extra long bristles help clean in hard to reach areas. The dental experts from Oral-B recommend using Crest Pro-Health toothpaste. For more oral care information, visit www.OralB.com or call 1-800-56O-RALB (1-800-566-7252). www.pg.com.