I use the Emmi-dental Professional for over a year and am very happy with it. Since many years I had problems with bleeding gums and had not found a solution to get this under control. Despite regular brushing and rinsing I constantly had blood in his mouth. I had used a variety of models of Braun Oral-B and imagined, so to brush my teeth well .... I had to regularly go to the tartar removal and had always continued my bleeding gums. So when a day, my dentist told me that I'm broken by the many mechanical brushing my teeth (the enamel was strongly attacked), I was looking for a solution - and found it !!! Ultrasonic cleaning !!! This real ultrasound is meant and not rotating brushes with alleged ultrasound !! For me as an engineer, the operation of it quickly became clear - the cleaning itself needs to change, since nothing is done mechanically by rubbing. The cleaning works only in connection with the special toothpaste and for each tooth cleaning I Need approximately 4 - 5 min. I brush head for about 10 - 20 sec hold at every point with gentle pressure.. The cleaning effect is very good! My teeth are clean and noticeably smooth. I have no bad taste in the mouth longer, no more tartar - and what is most important, I have for a year no bleeding gums more !!!! All in all, an ingenious invention! I can only recommend all !!!!!!!