The good part is that these strips are excellent at whitening teeth and stay on quite well. Also, they don't leak all over you mouth or taste too bad as some other strips do. After one use I notice much whiter teeth, which is why I'm giving this 2 stars instead of 1. The problem with them, though, is that after using just one strip for 2 hours, I feel like I had major dental work done. My teeth HURT! Not the dull ache I've had before with other whitening strips that was tolerable, but a very intense tooth ache. I can't even open my mouth because air hitting my teeth is so painful. I read other reviews about the pain but I didn't realize they meant pain like this, the kind of pain that prescription pain medication does not take away. I will not be using the rest of the box and will be taking Crest up on their money back guarantee. Sometimes beauty is worth the pain, but definitely not this kind of pain! Ouch! Stay far away if your teeth are even remotely sensitive!
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