I bought the sonic toothbrush to try and improve the appearance of my teeth after alot of research and because it was designed by dentists. The instructions are very clear in charging the toothbrush and explains clearly the features and how they interactivate when operating. i have been using the toothbrush approx. a week however it is taking some time on how to get the best use of the toothbrush. Even on the second mode which is far as I dare to use at the moment, is very ferocious, not having used an electric brush previously. But I have started to see a slight improvement in the appearance of my teeth. I have also changed my tooth paste so i think this is helping too. In the comimg weeks I will move up a notch to the third mode 'white' hoping to improve my teeth. I am pleased with my purchase and recommend the toothbrush.