This is a picture of me before I tried the whitening kit.
My teeth usually get SUPER sensitive when I have tried OTHER kits. I did not notice any sort of sensitivity with this product! You can also use this product with already fitted teeth trays and that is what I did. I used my clear retainer and it was super convenient!
Here is a picture of me and my daughter after one week. You cannot tell much of a different from the picture, but I assure you... There is a HUGE difference! I definitely recommend it!