I have been drinking more and more coffee lately - and the colour of my teeth is beginning to become tainted. I was wondering if I could use two whitening strips on my top row of my teeth? It would be really awkward for me to have white teeth at the front, but to have tainted teeth in the back. Is it safe to use two at the same time? Can I also do the same for my bottom row?
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I have a really wide smile and I used two on my top teeth a few months before my wedding with no problem. Maybe a little bit more sensitivity, but nothing unbearable that didn't go away.
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