Although it states it will not work on porcelain crowns it actually did on mine! One of my front teeth is a porcelain crown and I got it before I became a heavy smoker and cola drinker. It yellowed along with the other teeth but somehow the strips brightened it back to its original color. I have had no gum irritation or tooth sensitivity so far. The strips are easy to use, come off easily and leave no residue. I saw results immediately and am now on my fourth day and the results continue to astound me. Great product!

These whitening strips work really good!!! I love how I use them on the go! When I'm in a car driving to work or on the train even! It takes 40-45 mins to kick in and give you the nice white teeth! As a dental professional I recommend use these strips 1-2 a week for 30 minutes! Your teeth will become Snow White! Give it some time :)

I was pleasantly surprised by their kit. Very easy to use. Didn't make my mouth feel “weird” and my teeth feel and look better after only a few uses. I'm a heavy smoker and coffee/soda drinker. Always look out for coupons in combination with sales at the drugstore or grocery. Best time to buy.

I knew this product worked super well when me dentist complimented me on how white my teeth looked. I was in total shock! I try to use white stripes 1-2 a week. If I have a special event coming up I will use more often. The price is pay is so worth it. It's almost like a professional whitening at home that you can afford!

I've been using Crest white strips for several years now and have been extremely satisfied and happy with their results. It's not the results I'm disappointed in, but the fit of the latest version that I purchased which have a terrible fit for your bottom teeth! In the past, Crest made the bottom strip smaller/shorter & it fit great, but now it's the same length as the top strip which makes it difficult to place on your bottom teeth. It also doesn't stay in place toward the back on both sides and now that you need to leave them on for a full hour (rather than 30min. twice a day), it's not comfortable....my husband is in agreement! I hope Crest will consider going back to the other smaller strips for the bottom teeth in the future!

I remember using Crest Whitestrips back when they first came out. Completely satisfied. This time around not so much, which was a disappointment since I expected similar results. After the first box did not work, I decided to go ahead with getting a second box through Crest, as recommended. I used the product 30 minutes once a day, and did not use immediately after brushing, as recommended. It did make some difference, but my teeth still have a yellow tint.

These are easy to take on and off! I love that they're disposable so I dont have to worry about keeping up with trays or gel. They have a kind of bad taste when the whitening solution is working but they definitely give you a whiter, cleaner looking smile!

These strips are definitely effective, especially when used with the UV light. however, they are NOT ideal for people with sensitive teeth. Even if I only leave the strips on for ~30 minutes (rather than the suggested 60mins), my teeth are SOOO sore and sensitive for at least a day or so. Great whitening results though!

The BEST!!!! By far the best whitening product on the market right now! Super fast and affective for pearly white teeth! Helps with stains and doesn't require a lot of work or time. Lasting effect after just a few uses! Love these! They tend to be more on the expensive side but in my option are totally worth it! Definitely worth investing in!

i do these strip kits every so often and i always get compliments! the effects are noticeable!! they work like charm. i wouldn't recommend using everyday because too much could be damaging to your enamel. when used in moderation, i think these are great and a great pamper investment.