This sample went unused for a little while, but I finally tried it after I started using Opalescence whitening trays. The trays leave a gel on your teeth that you have to brush to get off, so I brush with this afterward since it's pretty gentle. (Whitening products temporarily weaken your tooth enamel to get below-surface stains out, so I didn't want to brush with my regular whitening toothpaste, which has abrasives in it to polish away surface stains.) I don't normally like cinnamon, but this taste is pretty good. I read some other reviews that it contains parabens, which are supposed to be a no-no, and that it doesn't contain fluoride—if that's the case, then I can't wholeheartedly endorse this product. I'll keep using it for post-whitening brushing though.