?We promise? Tooth brush electric set 1 year warranty, if you have any problems, please contact us, we will give you a satisfactory customer service.CONTACT US - Login your account > choose "Your orders" > find the order ID > click "Contact seller". ?Powerful Sonic Cleaning? New Upgraded Electric Toothbrush with the latest sonic technology to drive fluid deep between your teeth and along the gum line for exceptional cleaning and removing up 100% plaques, whitening your teeth and improving your oral health in two weeks better than a manual toothbrush. ?Smart Vibrating Notification Timer? Built-in 2 minutes timer to ensure scientific brushing time, It pauses every 30 seconds to remind you to change the brushing area. Develop Healthy Tooth Brushing Habits. ?6 DuPont Brush Heads? "W" shape design. Every Black Series toothbrush comes with 6 brush heads engineered by world famous DuPont; a world leader in quality & materials science. Each brush head lasts 3 months so 6 will last for over 1.5 years. ?High-Performance Brushing Modes? Clean, White, Polish, Milder, Soft. Suit different conditions of teeth of gums, so you can choose different modes according to your preferences and dentist's recommendations.