After first use my lips have tingled and were a bit dry, but probably because I was not used to this feeling only.
After the second application I had this problem already no longer.
I have to say that feel the teeth after brushing incredibly clean and smooth and has a nice, clean mouthfeel.
The battery life is hervorragend- I had for two weeks been charged yet at all.
I am so confident in the technique of sonic toothbrush, I'll definitely keep the toothbrush.
