Nothing really It's like a big eraser but doesn't take anything off. it makes a noise when you rub your teeth like a sqeek it was expensive for what you got. Not sure how to clean it after use. No english instructions at all. pictures don't explain much. Don't get this. If you brush your teeth then you don't need one. basically it's a single bristle ... Read more
um . not sure if it works. Its about the same as a pencil eraser. It does seems to be mildy abrasive. I would be careful using this you may hurt your enamel. All the instructions are in chinese (I guess) so I'm not sure how exactly to use it, I just tried to mimick the picture. I wouldn't recommend it. I'll try and get a picture of the back so someone ... Read more
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