Deliver noticeable results for cleaner, whiter teeth, and healthier gums. Now, an independent study has concluded, Brushes that worked with a rotation oscillation action removed more plaque and reduced gingivitis more effectively than manual brushes in the short and long-term. No other powered brush designs were consistently superior. Clinically Proven BenefitsUse an Oral-B AdvancePower 900 Series Toothbrush twice daily to: Remove significantly more plaque than a manual toothbrush. Remove significantly more stains than a manual toothbrush. Help prevent gum disease, the leading cause of tooth loss. Be as gentle on teeth and gums as a soft manual toothbrush. High-speed oscillating movements gently remove even heavy plaque buildup and stains. FlexiSoft bristles bend for gentle brushing. Long Interdental Tip bristles clean deep between teeth. Indicator bristles signal when to replace brushhead. Built-in timer helps ensure professionally recommended brushing time. Water-resistant handle. Comes with Charging Base and 2 Refill Brushheads.