The principle of operation of the device with the individual puffs is getting used to. But brings me along well, while my wife does not like this. So you continue to use an interdental brush, with which I can now again bad deal. So much for the personal views and habits. But clearly negative is the quality of the equipment, because the first device was after about 6 months, the replacement unit is now broken after a few weeks. In the first case the device was suddenly no longer turn and splashed almost to death. The replacement device may be a short time no longer turn on even charged. From a renowned company like Philips I did not expect such a scrap.
