With Power Tip bristles designed to reach deep and help clean hard-to-reach places, the Oral-B Bacteria Blast Toothbrush removes significantly more plaque than a regular manual brush. It features longer gum-massaging bristles that gently clean and stimulate the gum line. Bacteria Blasts's Max Clean bristles change from green to yellow when it's time to replace your toothbrush as suggested by the American Dental Association.