I agree with the one person who has 1 star: between comments from ambassadors (who therefore have not paid the toothbrush, it helps to put stars) and cans comments (no purchase verified) all persons "followers" in the manual brushing, but do not believe the difference in efficacy .... bah it's anything but give the urge to buy it ... Yet I could test one of my companion (I do not remember the brand) and I must admit that the sensation of "clean" is different. However, this technique gives false comments just want to run away ... damage the product for you ...