It works for me.
I'm pretty happy with this product.  I know it made my teeth much whiter.  I'm a coffee drinker so I really needed this.  Using once a day for a week (used 2 of the 3 tubes)  I am happy.<br /><br />I give this 4 stars ONLY because the light stopped worked after 2 days.  Otherwise I would rate 5 stars.
Rating: 4 stars