3 month usage indicator. The brand more dentists use themselves worldwide. Indicator Bristles: Blue Indicator Bristles fade halfway so you know when to replace your brush. Comfort Fit Bristles: Comfortably curved for grooves between your teeth. Gentle End Rounded Bristles: Specifically designed to be gentle on teeth and gums. The dental experts from Oral-B recommend using Indicator with Crest toothpaste. ADA Accepted: American Dental Association. Helps remove plaque. Helps prevent/reduce gingivitis. www.pg.com. www.OralB.com. For more oral care information visit: www.OralB.com or call 1-800-56-Oralb (1-800-566-7252). The dental experts from Oral-B recommend using Indicator with Crest toothpaste. Made in the USA (with US and imported parts).