Not worth the price.  If you want zero results waste your money on this.
It was not "easy to use". Product dispenses on a q-tip applicator.  Needless to say most people do not clean their teeth with a q-tip.  Had to use a brush and try to squeeze the tiny droplet out of the tube each time.  Used as directed and my teeth look exactly the same as before I started.  Absolute gimmick.  Do not waste your money.
Rating: 1 stars