So after a week of using this product daily, I'm not sure if I see a difference. They may be just a smidge whiter?? Now granted I haven't used the light addition very diligently, some nights I just add the gel to my trays.
I've tried really hard to take a very similar picture from the same bathroom. I'm moving on to a new tray tonight so will hold off any further whitening for now. Let know in the comments if you spot a difference!