It did not whiten my teeth at all, and really difficult to use without getting it all over your gums and lips! But you get what you pay for so I wasn’t expecting much, more like I was just kinda hoping maybe it would work a little!
I saw results after just two days of use! It did give me some teeth sensitivity but only while the product was on my teeth. Once it was dissolved, I was fine. I got a bit on my gums to it caused some sensitivity there too, but I give it a rest for a few days and I'm back to normal. Overall, I am happy with this product.