Bacteria guard bristles. Cleaner bristles (Inhibits microbial growth that may affect the bristles. The bristles do not kill the bacteria in the mouth or protect you against disease. Always clean the product thoroughly after use). Deeper reach (vs. a regular manual toothbrush; based on laboratory testing). www.oralb.com. www.pg.com. Questions? 1-800-566-7252; www.oralb.com.