I used the kit, and had no difference occur. I was very surprised because many years ago I used one of the first kits in this product line, and noticed results. I don't smoke, or drink coffee. Only drink red wines or tea occasionally. Adhered to teeth well, and stayed put. These strips are easy, and convenient to use.

These things are amazing! Really noticeably whiter after using one box. Also great that they're the only FDA approved teeth whitening product. 30 minutes a day is very easy and you can go around without worrying about them slipping off your teeth. Would recommend to anyone

I recently tried these for the first time. I heard that my teeth become sensitive but they didn’t. I would say that my teeth went from not white to semi-white. Overall I’m satisfied but I definitely need to buy again and do a second time to get the full effect.

These are the easiest teeth whiteners I’ve ever used and I love that they don’t really inhibit what you do. You can really wear them anytime and don’t have to devote a certain time a day when you know you won’t get anything done. They also pretty much work as expected!

These are amazing!! I’ve been using them for years and a box lasts me so long because you only need to use them a handful times a month. I don’t recommend leaving them on for too long because they can cause sensitivity. Most of the time I leave them on for less than the recommended time and still get results!

I have used crest whitestrips in the past so I was eager to try these. Although my teeth are several shades whiter it doesn't seem like I achieved the same whitening level as I had previously. On the positive side I would say my teeth were not as sensitive after using these as they had been when I had previously bleached them.

This whitening product has been effective for me multiple times over the past few years. I have used it in correlation with other Crest products (such as toothpaste) and I have seen a noticeable difference. They only negative thing I would have to report is that it occasionally makes me teeth sensitive to heat and cold, but overall, I love the Professional Effects!

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.

It's so amazing, that it really works. I am soon 24-year-old and I have had since childhood yellow teeth. I don't smoke but i drink coffee and sometimes but rarely red wine. I have a healthy lifestyle. I was really skeptic and sure that doesn't do anything to my teeth. But I want it to try, so I used 7 strips half of the year. Now i can see in the mirror and photos that my teeth is naturally white and I have lot of confidence to smile too. Enamel is not damaged and doesn't feel uncomfortable, they also stay place. salivary flow was strong with the strips. I will use them again. I can warmly recommend, be surprised positively!

This kit keeps my teeth looking super pearly white. I use it every other week when I need to freshen up my teeth from drinking coffee and wine and other things that stain my teeth. They’re pretty easy to use too. Just place the strips directly on your teeth, avoiding your gums. I made the mistake of letting it touch my gums the first time and it made my gums (both the front and back) really sensitive. It felt like a blister in my mouth. But once I got the hang of it I began to see results!! The more often you do the treatment the more sensitive your teeth are, so I would only do it until you see results and then refrain from usage until you need it again.