Oral-B CrossAction Max Clean Toothbrush is clinically proven to remove more plaque bacteria than a regular toothbrush. Max Clean bristles change from green to yellow when its time to replace your toothbrush as suggested by the American Dental Association. The Max Clean bristles are also designed with high-low orientation to remove 90% of plaque bacteria in hard to reach places. CrossAction bristles are angled in opposing directions to lift out and sweep away plaque. Angled bristles for 90% deeper reach* *than a regular manual toothbrush in laboratory testing. PowerTip Bristles: 550 extra long bristles to help clean hard to reach places. Max Clean Bristles: Max Clean bristles change from green to yellow when its time to replace your toothbrush. Oral-B is the #1 dentist-recommended toothbrush brand worldwide. Made in United States REPLACE BRUSH EVERY 3 MONTHS. ©Procter & Gamble