I drink 1 cup of coffee every single day, sometimes 2, I had used the whitening strips before with some results. Now as with any technology, the UV lighted mouth piece is a game changer! In just 2 weeks of using it, my teeth are very noticeable to me. It is very easy to use, just set the timer on your phone, I watch a short video, and done! I bought an extra set of 8 pens, so I have enough for the next year and a half, so the package says. If I would quit drinking coffee I could have better results, but my plan is just to offset the yellowing from the coffee. I highly recommend this product, and it is very popular right now. I think for the price, and the great way that it's set up, it's a no brainer!!!
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