Worthy to buy.
I’ve never try it before. Because i never believed it. So i didnt know why i give it a try. I got one. My and my partner uses it every. It works perfect. My partner , he drinks beer , wine and tea for long time then his teeth got stained. Hard to come off. So We use it every day. How come it works perfect. His teeth better than before so much.
Rating: 5 stars