I picked up a 3-day whitening system called LUSTER for free at the store, as I cashed in some Shopper's optimum points, and it is by far the best teeth whitening system I've ever used.

Luster's claim is that it will take your teeth 6 shades whiter in 3 days, and you use the product twice a day. It comes with an "activator" mouth wash that you use after you gently brush and floss your teeth. Swish the mouth wash for 10 seconds, and then paint the whitener on your teeth - let it dry for 10-20 seconds before lips touch them, and then let it sit for 10 minutes. Repeat the mouth wash and painted whitener. First thing in the morning, and last thing at night.

The regular retail was $30.00. I am on my 1st day (doing the evening application as we speak) and I can already notice the difference.

The BEST thing about it? Zero tooth sensitivity! I have had bad luck in the past with professional grade trays and gels, and even Crest whitening strips - they make my teeth killer sensitive, and I can't handle it.

My teeth were in pretty decent shape to start (probably a 3 or a 4 on their in-package shade meter), but it's definitely cleaning them up nicely and I'm pretty impressed with the results.

I'm going to keep it up for the recommended two more days, but so far so good.

Anyone else use this product before?