Before you reset your toothbrush: Make sure you have a decent amount of charge before resetting your toothbrush. A low charge level can lead to unexpected operating problems
Press and hold the power button for about 10 seconds. The toothbrush will shut down. After pressing the power button again, the status light will then blink quickly in red, meaning that the toothbrush has been successfully reset.
Don’t be alarmed if the brush vibrates during the procedure. It’s normal.