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Crest Advanced Seal Tooth Whitening Strips really do work! The bad thing is that I could personally tell I had them on and did not feel comfortable drinking while I had them in at first. At first they were hard to get used to actually but I decided to use them before I went to bed so there was really no issue about that. You only need to leave them in for about 30 minutes or so but I left them on a little longer, I would end up forgetting I had them in while I watched TV and did my work, relaxing at home. Then you just peel them off slowly, no problem! You are directed to wear them for 30 minutes for 7 days, though if you buy the double pack there are 14 days worth; the first time I used them both me and my husband tried it out; the second time I used it for the 14 days instead, which was even better! My teeth used to be dirty and a little yellow becasue I am an avid tea drinker - The product noticably worked! but unfortunaly I think you may need to use them again in the future if you restain your teeth. The only negative was, as I was told by my dentist, I do not know from personal experience, but if you have cavities this product will hurt; the chemicals will sink down into the crevises and holes in your teeth and become very painful so make sure your teeth are nice and healthy before use. I had no pain whatso ever! Again it is easy to use, easy to remove, and works pretty well. Not sparkeling clean and white but definntly brings things to a better shade.