Crest Whitestrips have become extremely popular for their convenience and affordability. They do work and can be an easy solution for whiter teeth, but you need to know some of the risks with this teeth whitening method before you try it. In this post, I’ll discuss how Crest Whitestrips and similar brands work. How crest white strips work Crest Whitestrips work by pressing on a clear strip of whitening gel against the teeth for several minutes to whiten them. The strips are made of a plastic material and are coated with adhesive and hydrogen peroxide or carbamide peroxide whitening gel. It takes several minutes for the whitening gel to penetrate the enamel to “bleach” the teeth. The same ingredients dentists use to whiten teeth are found in these at-home whitening strips but at lower concentrations