These did not really work for me. My teeth are not the white shade I was looking to accomplish. I have a chipped tooth and it totally activated the pain! Not the products fault, I should get it fixed. Still looking for a product that will totally whitening my teeth

For the price these whitening strips are very good and after trying them for a few days the difference in the color of my teeth was definitely noticeable. I have worn the strips for an hour at a time and gone about my daily business. When it comes to taking the strips of its a bit difficult to do so and this part is where i got to taste the whitening ingredients which was not very pleasant. If you could make it easier to remove the strips after the treatment it would be brilliant.

I love these Whitestrips because of how well they work. After leaving them on my teeth for 30-45 minutes I have a smile that can be seen from a mile away. These strips also don't slip around like a lot of other ones do. My main con on this product is how sensitive it makes my teeth. I can't use more than 2 a week or else my gums get white and my teeth ache when I eat or drink something too cold. 

These will make your teeth white, but leave them SO sensitive in the process. It is almost not worth it to me to be left with such sensitivity, it was so bad that I couldn't open my mouth in the winter time or I was almost crying in pain. I followed directions and did exactly as the packaging says to do so it is not a good product if you have a history of sensitive teeth.

I've been using these since high school (10 years) and they are incredible. They make my teeth noticeably whiter after just one use. I typically only use one strip every couple of weeks now for maintenance. The only downside is the sensitivity it causes but only lasts a day or two.

Super easy to use and worthwhile. I could probably have better results if I used this regularly. Instead I use them as a monthly touch up instead of the daily use they recommend. At my last dentist visit, they all oohed and ahhed over how white my teeth are! No problems with sensitivity.

I don't know if it's just me but whitening products don't seem to make my teeth whiter. I gave three stars because these don't make my teeth sensitive and they are easy to use. Do they whiten? I have yet to see a difference. I would rather spend the money and get it done professionally.

Had years of stains and very bad stains with receding gums and parts of my teeth with stains that the dentist could now polish away b/c they were too sensitive These strips made those ugly gum line stains disappear and now my teeth are so white, you can't even tell my gums have receded. Worth every penny and my teeth aren't even sensitive after. sooo happy OMG perfect

I use this system twice a year to keep my teeth white. They're comfortable and don't slip and get the job done as well as a treatment at the dentist. I leave them on a little bit longer than recommended but that has never been an issue. I always use sensitivity toothpaste on nights that I use these just so I don't have to deal with any sensitivity issues.

I had used the original whitesrtips before and didn't really notice too much of a difference and they slid off very easily. I have just finished my first box of Crest 3D Whitestrips Advanced Seal and must say I was VERY happy with my results. I noticed a difference in the first use and every day after that. They did not slide or come off my teeth at any time! I would recommend this to everyone I know! It is definately worth it.