does make a difference over time
I have been using this product for about a year and a half.  I can tell the difference.  When I started my teeth had a definite yellow tint.  I'm 65 years old and this happens as you get older.  It took several months, but my teeth no longer have the yellow tint.  There is no dramatic change, but over time the yellow goes away.  My teeth are not bright white, not even real white, but definitely not yellow.
Rating: 3 stars