"The smile is the centerpiece of beauty," says Dr. Jonathan B. Levine, an aesthetic dentist. "It's like a stage -- when the lips go up, it's showtime!" For three women who are self-conscious about their mouths, this is one show they wish no one could see! In Rachael's latest human lab experiment, they agree to put the smile-enhancing claims of three products to the test, and Dr. Levine weighs in on their results.

Luscious Lips Lift Pumper

Allison, 24, wishes she had plumper lips. "I want fuller lips because it looks very feminine and it even outs your face and makes you look more beautiful," she says. She tries the Luscious Lips lift pumper, which claims to increase your lip size naturally by a vacuum process that coaxes fluids and increases circulation to your lips. "This is the absolute craziest thing I've ever done!" Allison admits, holding the odd-looking device. "But if it works, then I'm glad I did it!" After using the device, she's ready to be confused with Angelina Jolie. "For two hours they stay plumped up," she says. "After that they start deflating and you go back to their normal state. But for those two hours, you are fabulous!"

Dr. Levine says, "I think it sounds great from a confidence-building standpoint and from the idea of testing it before something more permanent or more invasive. One caution is to make sure you stay compliant and don't abuse it. You could cause a little bit of harm to the lips because you're forcing blood to the surface. So you just have to be a little careful of how often you're using it."

Angellift OTC

Sarah, 35, says she's not the only one who notices the wrinkles around her mouth. "Even my 6-year-old comments on my laugh lines!" she cries. "I tend to laugh a lot, but then I stop short -- I don't give in to it all the way because I'm so embarrassed by my laugh lines." Sarah begins using Angellift Over the Counter Derma Strips, which are supposed to diminish lines around the mouth by inhibiting muscle contractions in the perioral area. "It feels like I have a big wad of gum in my mouth, or I'm trying to hide something -- I really hope it works!" After four days of use, Sarah says she noticed one particular crease seemed to be a little less in depth. "I was like, wow, there's something happening here," she smiles. "So in six months, I'll be like, where'd they all go -- hopefully!"

Dr. Levine explains, "The Derma Strip is getting underneath the lips, and it's supporting the soft tissue, almost acting like a scaffold. What's important is the muscles are going to be tensed -- they're gong to be exercised when you're doing it. As soon as you pull out the derma strips, there's going to be a fall back of the lips, the scaffold is going to be removed. So what's important is that there's some kind of muscle tonicity getting created when it's in, so that you're eliminating or lifting the soft tissue and thus eliminating the wrinkles."

Snap-On Smile

"I hate my crooked teeth!" admits Carissa, 23. She says the overcrowding of her front teeth "is not really attractive." Carissa agrees to try Snap-On Smile, which claims to cover up teeth that are crooked, chipped or discolored. After a mold is made of her teeth, she's fitted with her own snap-on smile 10 days later. "Whoa! That's a smile right there!" Carissa beams looking into a mirror. "It feels a little awkward at first, like a weird object is in my mouth, but I am totally excited about my new smile." After two weeks of use, Carissa says she can speak, sleep -- even bite into an apple with them on. "People are actually looking at my smile and not my teeth," she says. "I prefer this smile 10 times -- a hundred times -- better than my actual smile."

Dr. Levine says, "This product is not to be confused with permanent solutions -- orthodontics, aesthetic dentistry, bridges -- this is a dress rehearsal for more permanent work. It's either going to close spaces or move teeth or change the shade of the tooth, in a way that somebody's going to have great confidence. It's made out of plastic -- not long-lasting, but it allows a person to take that dress rehearsal of what will happen, what will I look like, with these kinds of changes to the smile."

With so many products out there claiming to improve your smile, Rachael asks the doc how a person would know which one to try. "You really have to check in with your professional, whether it's an aesthetic dentist or a dermatologist," advises Dr. Levine. "And do your research -- go on the internet and check out the product. Then test a couple of them, because then you'll have those relative data points of comparing one product to another and see what works for you."