I thought it was a nice device and I was glad to try it. For me, the simultaneous cleaning of all or at least most of the teeth has proven itself. I started by wetting the mouthpiece. The brush's mouthpiece is made of hard plastic with bristly bristles at the top and bottom. They're more on the hard side. So that can be good or bad depending on what you are used to and what your teeth can take. When I put it in my mouth for the first time, I was surprised at how big it was. It looks big but I assumed it was a standard size. It is not. It's huge. I had to open my mouth very wide to fit it. I could wrap my mouth around the brush and then put my teeth in the tray. I was hoping it was just an uncomfortable fit and I would get used to it. I started brushing, moving it from side to side. First of all different. I felt like I was perfecting my movements and trying to make sure my teeth were touching the bristles in the tray. During this process I encountered two problems. First, the giant tray made me bleed. The ends of the plastic tray are hard and were pushed so deep into my mouth that it actually hurt and caused bleeding. It wasn't my teeth that bled. It just doesn't fit. A large mouth, most likely, will not encounter this problem. The second learning curve was how to hold the black part of the pen. It's thick and wide. But the power button is on. It's easy to accidentally press it when you move the handle to brush your teeth. Then he proceeds to trim the middle brush. So it's best to hold on to the sides. Obviously the grip is a technique. The mouthpiece is massive. It literally made my mouth bleed where it was in my mouth. There are other attachments and they work well. Of course I wanted a mouthpiece, which is why I bought it in the first place. Although I can use brush heads, they are no different than the toothbrush I normally use. A different mouthpiece size solves this problem.
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