I am always looking for something to keep my teeth sparkling white but sadly this didn't seem to make the difference I had hoped for. The product doesn't whiten like I had expected it too but it did have its other benefits!
For one, the nasty mouthwash burning was not present, cheaper brands seem to be unbearable but this did not give me that problem at all! The taste of it is fresh and my mouth certainly did feel fresh throughout the morning.
The promise on the front of the bottle: Reduces teeth stains by up to 39%
Promise on the back of the bottle: helps maintain the natural whiteness of your teeth.
The two points seem to cancel out each other and again after 3 weeks of use, my teeth were no different in whiteness to before, it technically kept the back bottle promise, but the smaller stains on my bottom teeth were no different so it broke the promise on the front.

All in all, its a great mouthwash but if you need a teeth whitener go elsewhere :)