After using two full packs and leaving an average of 90 minutes each time, I don't see even a slight change in shade on my teeth. If you still insist on using it and if you have small teeth like mine, I suggest cutting the strip to a shorter width before applying. Otherwise you will be very painful/sensitive in places where it touches the gums. I used Prevident toothpaste for 2 weeks before using the strips and had no sensitivity issues. But that could be because the strips don't work as advertised!
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