I have bought whitening strips from different sellers over the years and they are all basically the same. The teeth are whitened with peroxide. So you can also shop at the best price-performance ratio. I've found these strips to work just as well as others and cost half the price of name brand products. I drink coffee and wine, so coloring is a common problem for me. After using these strips for a week I definitely see good changes. A few shades lighter. Of course this is temporary. If I don't stop drinking coffee and wine. Nothing happens!
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