Unique technology brings you a powerful yet gentle clean. With sonic technology the powerful bristle vibrations drive micro bubbles deep between your teeth and along your gum line for a refreshing experience. 31,000 brush strokes per minute gently clean your teeth, break up plaque and sweep it away for an exceptional clean. Sonicare toothbrush provides you with a thorough clean without being hard on your teeth and gums. Replace brush heads after three months, may need replacing sooner.