Thanks to Sonicare technology, the head moves at high frequency, but gently brushes the teeth and directs the fluid deep between the interdental spaces. The 2-minute timer on this Philips Sonicare electric toothbrush ensures the cleaning time recommended by dental health experts. The 30 second interval timer indicates the completion of a mouth quadrant and signals to proceed to the next quadrant for deeper oral cleaning. Thanks to the Easy-Start program, it gently increases the power in the first 14 uses to allow you to get used to the Sonicare experience. Bristles with replacement notice: the bristles lose color to indicate the need to replace them. For the removal of hidden plaque. Helps improve gum conditions. Helps maintain white teeth. Removes triple plaque. Rechargeable - Duration up to 10 days between two refills. Safe on orthodontic appliances, operations, capsules and implants.