Review (4/5): Works, but some parts are cheaply made
Overall the product is easy to use. I did see good results in terms of the whitening. I drink coffee a lot and I could tell the difference in whiteness after four sessions. So, it works for me.
The bad. The battery that hangs on your neck is totally cheap and flimsy. The connection on mine where the mouth guard clicks into it was so cheap that I had to keep checking as the light would suddenly go out. I had to twist the guard plug to get it to light up again. If they made this just a little nicer I would give this 5 stars.