I have been using the product for 3 1/2 months now. I haven't noticed any noticeable results and white spots appear on my teeth that disappear over time with each use. I'm pretty sure I'm using it the way it's supposed to be used, so I contacted the company. They gave a quick reply saying that once you start using it the stain results are fine. After this letter I gave him enough time to try it and now I'm ready to try something else. 4 stars only because it arrived on time and the company was very quick to respond.
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