I didn't see a brightening but it ended so quickly how has TIME? It says to use 2 sprays per aligner/retainer, but that's not possible. You can't cover every one of them with just two sprays, especially without knowing exactly how much and where to spray with the first spray. I found that the first spray spattered unpredictably where I wasn't aiming, so it REALLY took 3 sprays per aligner. It did NOTHING to whiten the aligner itself. Yummy, but took me a week! It is intended to be used up to 4 times a day. If I did THAT, it would go on for days. Pretty disappointed.
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