I saw a small, very small difference, which I was trying to notice as well, difficult to apply, they melted with saliva

Excellent product for its price.
It applies easily and does what it promises.
Certainly, someone who has very yellow teeth will not see a difference because they need something stronger and more effective, but I, who do not have yellow teeth, saw a difference immediately, after just 2 uses.

Waste of money, it does absolutely NOTHING! It leaves an aftertaste on the teeth similar to Turkish delight (or gelatin if you prefer) and I have to rinse them off!

It's not worth even trying, I couldn't even place the strips on my bottom teeth as they melted too quickly and stuck to my teeth. I struggled to apply one strip to my top teeth, which not only didn't come off but also came apart into a thousand pieces. Of course, there was NO RESULT at all.

Very good, they don't work miracles but you will see a significant difference. It's not comparable to whitening but they help. Tip: put saliva on your teeth or on the strips beforehand to easily stick to the teeth

I use the films every day for a few days now, taking photos daily. The difference is not crazy, but they have whitened some tones. For their price, I believe they are worth it.