Trying to polish up that smile? The Shopping Bags look at toothpastes, gels and laser treatments to see which process gets teeth whitest and brightest. Later in the show, find out how to buy a treadmill. Studies show it’s the most effective piece of cardio equipment. Anna and Kristina find out how much you really need to spend on this expensive machine. And say goodbye to those orange tans of yesteryear. The Bags test out 10 kinds of self-tanners to find out which ones are best at delivering that honey-bronzed glow. And if you don’t like the tanning product, can you take it back? The Mystery Shopper heads out to make a return, without the receipt.