This stuff does the job. However, you'd have to stay away from coffee or get more of this stuff as you will develop yellow teeth quite quickly with coffee. Otherwise, very good.

I bought these a while back ago, I didn't like the results. I don't think they really work, they have a satisfactory guarantee, or your money back. I wasn't motivated to get my money back, only once I felt a stinging sensation, that was after I brushed my teeth "not recommended" yeah it says not to brush your teeth before you use this product. I did anyways and that's the only time I ever felt any stinging sensation. The product didn't do it's job, I don't think I'll buy anything from crest again related to whiting. I should have saved up my money and got my moneys worth, I'd advise you do the same. Just save a bit, to get better results else where.

I bought this and carefully read the packet and reviews/suggestions from everyone. Before I put them on I use a toothbrush (that I've specially designated for this) to gently scrub my teeth, then carefully put them on. Immediately I start drooling so much, that I keep a bath towel under my face to collect everything! Yes, it sounds gross and it is gross. But I don't want to swallow any of that nasty taste or lose a precious whitening strip! These things make me drool like crazy and for 30 minutes I maintain the biggest smile possible with a folded over bottom lip - to keep the lower strip in place. Every few minutes I check with my fingernail to make sure the bottom strip is still against my teeth. I have had no problems with tooth sensitivity (but I don't eat a lot of cold foods), burns, or anything else. They do seem to be working. I've been doing them at night, I'll do 2 or 3 in one sitting (the manual says that's as effective). Then I'll stop for a few days. As some other people have suggested, I will probably finish this package and then continue to do it maybe once a week. I read somewhere that to appear natural, your teeth should be no whiter than the white in your eyes.

This product gets 4 stars because of all the gross drooling, I can't imagine using this product anywhere other than behind a closed and locked and mirror-less room. The drooling causes the bottom strip to move around too much. Maybe this should come with a tray to cover the strips to keep them dryer.

When beginning, they can make your teeth super sensitive. I recommend starting at night an hour before going to bed, that way any sensitivity has time to go away by the time you wake up the next morning. After the initial period of sensitivity, they seem to hurt less-- so I do it twice before going to bed (for 1h+), and then I don't have to deal with any discomfort while at work.

I'm 31 years old with fairly white teeth naturally, but I am a daily coffee/tea drinker. I've used whitening packages/trays purchased from my dentist twice, but I am honestly just as pleased with the results from the Crest Whitestrips for whitening my teeth when they begin to look a bit stained. I have very sensitive teeth/gums, so I rarely use the strips more than once a day and usually have to skip a day between applications. I also use a toothpaste (like Sensodyne) when I am whitening and this eliminates most discomfort. At this point, Whitestrips are used for "maintenance" and I have been working on the same box for at least a year! I whiten a few time every few months and this works for me. I'm sure there are many different degrees of staining/yellowness, but for mild discoloration from tea/coffee, I would definitely give these a try before an expensive trip to the dentist.