I like this product and I still keep buying it but I cannot say that I have noticed it has whitened my teeth, although my teeth aren't exactly stained. I look at it as a preventive product.
It leaves a 'different' taste in the mouth that is not like the regular minty mouthwash, but it is not bothersome.
I also like that it does not contain alcohol which in the long run actually helps combating mouthwash. It gives me confidence when I use this mouthwash.
The price is a bit on the higher end so I would recommend using the whitening toothpaste too to get the most out of it.