I like the blue/red whitening mouthpiece. I believe it works, though I have not had the opportunity to use it every single day since I’ve had it. I used it for 3 days in a row and saw a difference. I like the fact that I had a question about something, and it was answered the next day. What I’m not too thrilled about is the whitening toothpaste. If you wet your brush, then apply the paste, it liquifies in your mouth to the consistency of milk. But if you apply it to a dry brush, the consistency is a little better and more apt to stay in your mouth and not dribble out. Not sure what the whitening ingredients are either. It doesn’t feel gritty, and I saw no peroxide in the ingredients. Would definitely not recommend the toothpaste. The 4 stars are for the whitening wireless mouthpiece. And I give ZERO stars to the toothpaste.