"The strip stays on very well and although I have never personally experienced strips sliding around there is little chance that these strips will move."
"They adhere to the teeth very well."
"These Advanced Seal strips totally solve that problem. They adhere much better with a thicker stickier peroxide gel."
"Strips stayed firmly on teeth (no slippage) while wearing."
"They do not budge once you put them in place. My teeth are sometimes sensitive and it they really don't cause much extra sensitivity."
"The advanced seal strips stay on for the entire time, and there's no sliding whatsoever."
Cons:
"The paper does start to shift and the stickiness inside the strips starts to slide around."
"The strips become extremely sticky and slimy during usage, so it is almost impossible to peel them off of the front side of your teeth."
"Once they are even the tiniest bit moist from saliva, they start sliding around."
"The latest 14 day package has different shaped strips and they don't stick well, but tend to float off while you wear them."
"They don't stick at all!!"
"The bottom strip is RIDICULOUSLY SMALL and they don’t adhere or stay in place properly."
"The last two boxes of this product that I have purchased have had a terrible percentage of the strips that are dried up and don't adhere to your teeth."
Effectiveness
Pros:
"Did they work? Yes they did!"
"I'm very happy with my inexpensive, 14-day whitening treatment."
"Trusted brand that delivers on its promise to whiten your smile."
"I saw a difference and every time after that for a week, they got just a little bit whiter."
"I have used these before and found them easy to use and effective."
"Visible whitening after a few days."
"After about a week, my teeth were significantly improved and I received a lot of compliments."
Cons:
"Whitening was uneven - especially where teeth are close together."
"The change in whiteness was most noticeable during the first three days of use, but it seemed to slow down after that."
"Finished all 14 treatments and no improvement noticed."
"Disappointed my teeth didn’t change at all."
"Whitening seemed to slow down after the initial noticeable effects."
"After a few days, my teeth went back to their original colors and now it looks like I never used them at all."
"Only whitened a little bit and then as soon as it was completed they turned back to the old color:(."
Sensitivity
Pros:
"They haven't burned my gums or even made my teeth ache."
"Was Sensitivity an Issue? The short answer is no."
"I didn’t have any sensitivity problems."
"I have sensitive teeth and have not found any problem using these 2 -3 times a week."
"I didn't notice any sensitivity while using the Crest product."
"But I love that I do not get sensitive teeth at all after usage."
"After continuing the usage of the whitening strips I found that the pain eventually disappeared."
Cons:
"They do also make my teeth sensitive, so I never use them every day."
"Unfortunately, I do experience teeth sensitivity after using them."
"However, after using just two of them my teeth became very sensitive."
"I will say my teeth are sensitive for the rest of the day after I whiten, and I can't whiten two days in a row."
"My teeth became extremely sensitive! I never suffer from sensitive teeth but this was horrendous I could not even drink luke warm water."
"My gums were becoming white and very sensitive to the product or chemicals."
"My teeth were sensitive to cold and hot food after the treatments."
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