[This review was collected as part of a promotion.] I have always used an electric toothbrush but was amazed how clean my teeth look and feel using the Diamond Clean 9000 . My old brush has now gone in the bin . The app is great as it notifies you if your pressing to hard which at the beginning I seemed to be doing quite regular . I was very sceptical when looking up the cost but I must admit that the Diamond Clean 9000 is worth every penny and would recommend these to everyone . I actually look forward now to brushing my teeth