They work!!
I agree with the other customers' reviews.  This system does what it claims to whiter your teeth.<br /><br />Listening to others' reviews, I try to be careful to put the strips into my mouth.  So, I have no problem to put them in.  However, it is definitely not allow you to talk freely when you have the strips in your mouth.  I also don't think you can eat and drink while the strips in your mouth.  I hope Crest will give some extra strips in case one mess up or break the strip unintentionally.<br /><br />I also find that the strips are very small.  I have small teeth but the strips are not able to cover them all.  I think both the strips for upper teeth and lower teeth only design to cover the front 8 teeth both on the top and on the bottom.  I am wondering what happens to my other back teeth.<br /><br />Overall, I think you will get a brighter smile, but not a brighter laugh.  It is because people will notice your back teeth are still look yellow.
Rating: 4 stars