The photos I attached are ONE DAY APART. This product is insane!! This is after 2 whitestrips, one at night and one the following morning (you should probably wait 24 hours but I was eager to see what would happen). I used these whitestrips in conjunction with the Crest 3D White toothpaste and mouthwash, if that makes a difference. The only side effects I've noticed so far are the ones disclosed by Crest, which is tooth sensitivity and minor gum discomfort. They say that thesr are temporary, so hopefully that is the case. One thing I do want to say is you should be careful not to let the strips overlay on your gums too much, it hurts a little and it can cause blanching (turning gums white) but it's temporary. Other than that, I am SUPER SATISFIED with this product, and will definitely use all 21 strips. I AM NOT IN ANY WAY SPONSORED BY CREST, I JUST WANT WHITE TEETH Y'ALL Read more

SO DISAPPOINTED!!!! AFTER SEEING ALL THE GREAT REVIEWS, BOUGHT THE MOST EXPENSIVE ONE! NOT A GOOD EXPERIENCE1- THE PRODUCT DID NOT WORK FOR ME2- THE TEETH SENSITIVITY IS VERY BAD FOR 2 DAYS THEN IT'S LESS PAINFUL Read more

Every little packet has a bottom and a top strip but in about every other packet, one of the strips (sometimes the bottom and sometimes the top one) are completely DRY and do not stick to the teeth. So I feel like I am getting ripped off, as I am only getting about half or a bit more of the strips to work and the rest just come out dry and are not usable. I would appreciate if the seller would do something to make this better for me, as I trusted that all the crest white strips in this box would work, so I could get the full effect, as advertised. Thank you. Read more

This "Flexfits" version that I purchased has a manufacturing defect ( but the "regular" versions that I have used are excellent). WHEN YOU TRY TO DETACH THE FLEXFITS WHITENING STRIP FROM ITS SHEET, THE "BACKING" SHEET PULLS OFF ALONG WITH THE WHITENING STRIP, EXACTLY DUPLICATING THE WHITENING STRIP AND ADHERING TO IT. THIS CREATES AN INVISIBLE BARRIER SO THE WHITENING CHEMICALS CANNOT REACH THE TEETH, AND THE STRIP CANNOT STICK TO THE TEETH. NEW CUSTOMERS WOULD BE UNAWARE OF THIS INVISIBLE BARRIER. EVEN IF YOU NOTICE IT, IT'S ALMOST IMPOSSIBLE TO PEEL IT OFF WITHOUT DAMAGING THE WHITENING STRIP. This could explain negative reviews about it being a rip-off, not sticking to the teeth, too stiff, doesn't work, etc. Read more

These are my favorite whitening strips. I've tried the charcoal, tooth paste, gels, lights...you name it and this is the only one that truly works. They stay put, work quickly, and I get results instantly. Occasionally they make my teeth sensitive, but I get the same white results without sensitivity if I take them off 15 minutes early. I have used these for two years now and the results last me about a little over a year. Once they are the color I want, I use them once every week or two to maintain a white smile. Worth every penny. Stop looking and JUST BUY THESE Read more

I'm pretty disappointed since these 3D Supreme strips didn't do much for me. I only saw a slight difference after 21 consecutive days of use for an hour each day. I've used the cheaper Crest strips many times in the past with amazing results. My teeth are super sensitive and not once did my teeth get sensitive using these. Normally, my teeth would ache by day 2 or 3 with the cheaper ones and I'd have to take a break. Not the case with these, which makes me very suspicious. The only plus is that they stayed on really well. I'm wondering if I just got a bad or expired batch, even though the exp date on the box was 2019. Read more

Bought two boxes after my dental hygienist recommended this particular one. I used them years ago but I couldn't remember which Crest strips were the best value with the best results. It was these! I drink coffee every day too. I'm only half way through with the box. I may just stop and save the remainder. Read more

I ordered supreme flex fit no slip. I received a different type of crest white strips. I have ordered many crest strips and the supreme flex fit work the best in my option. The other types “slip” and do not whiten the best. I was disappointed when I realized I was sent another type. Unfortunately, I did not realize until after I had opened the box and used a set.I did not receive the type of crest strips I ordered! This has never happen to me before.I have been a dedicated customer to crest white strips, I wish I would have noticed before I opened the box. Be aware customers-check before you open your box. Crest has so many difference types. Read more