This LED light tray by MySmile DOES help accelerate the whitening process when used with whitening gel. I didn't feel so confident that this product would have any effect, but the morning after I used it before bed (the previous evening), my teeth were NOTIBLY lighter when used with the whitening product I use. For me, that says something! My teeth just don't whiten very easily with typical whitening products. Whitening strips seem to have no effect on lightening stains on my teeth- they just make my teeth painfully sensitive the next day. But this product accelerates the whitening gel bleaching process. I use this with the gel about every other day, and the LED light tray doesn't affect sensitivity- at least not for me. I have very sensitive teeth when it comes to whitening products, and it's so so so nice to have a product that helps whiten without worrying about tooth sensitivity later. 5 stars!