The gel is pressed against the teeth for several minutes to penetrate the enamel layer and “bleach” teeth. According to my dentist, the crest strips were just as good as the whitening that they would do. Teeth Whitening Using Hydrogen Peroxide Rfrugal It worked extremely well, and i couldn't be happier. Do white strips work reddit . Crest whitestrips work by coating the teeth with a gel that contains hydrogen peroxide or carbamide peroxide. Normally one would want to touch up the teeth for a day or two once a year to maintain the whiter shade. Do not brush your teeth for at least two hours. Most whitening strips are made out of polyethylene, which is a thin, elastic type of plastic. Yes, the 3d white professional whitening strips work really well. Crest 3d white strips before and after reddit secret to. Teeth whitening strips contain peroxide or bleach. This is usually five minutes or fewer. I had bleached my teeth with a custom bleaching kit i received from m...