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Instead of taking your chances with cheap drugstore whitening kits, perhaps you should consider buying a specialized whitening kit on the internet. Not only are these more reputable as far as their results, but they are much safer on your teeth overall. Most of these kits work in about half of the time that the cheap drugstore kits work, and they will not cause sensitivity to your teeth. If you've used kits in the past that have made your teeth overly sensitive to hots and colds, you should know that the kits you can buy on the internet will not do this.