Cost: $150 to $200, $50 for touchups
Lasts: 2 to 3 weeks
Who should do it: Women with sparse, straight lashes, those who can't stand mascara or anyone with a special event coming up, like a wedding.

Why you should get it: Sometimes, no matter how much mascara you wear or how many curling techniques you try, your stubborn lashes remain puny and pathetic. With lash extensions, you'll wake up in the morning with the most amazing curl, volume and length of your life -- and you can go sans mascara for weeks. Because the lashes also define your lash line, you can often skip wearing eye makeup altogether -- a major time-saver.

Big bonus: They look real. Since the extensions are applied to each individual lash, they look more natural than falsies, says Sabrina Sasson, owner of WinxBeautique, a lash spa in Los Angeles.

Know before you go: Since the extensions are glued onto your own lashes, when they fall out, some of your own lashes may fall out with them. So when you stop getting extensions you might end up with stumpier lashes than when you started.

Also, if you tend to sleep on one side more than the other, the side that rubs against your pillow will lose lashes more quickly. And while no mascara can compare to eyelash extensions, the required touchups do add up. Assume an annual cost of roughly $1,000.

Cost: $50+
Lasts: 2 to 3 weeks
Who should do it: Anyone with a vacation or special event coming up, like a wedding.

Why you should get it: If your nails mysteriously chip one day post-mani, or you work out a lot, gel manicures can be a lifesaver (because, really, who wants to walk around with chipped polish?) Gel manicures can also be great for women with weak, brittle nails. Samira Asemanfar, founder of Bellacures nail salon in Los Angeles, says, "A gel manicure will give the nails a layer of protection from daily wear and tear, which allows the natural nails to grow underneath."

Know before you go: Removing the gel requires soaking your nails in 100 percent acetone, which is very drying, says Asemanfar. Plus, "some people peel the gel off, which is even worse than the acetone since a layer of your nail bed comes off with it." Then there's the fact that you have to cure the manicure under UV light, which some experts say may cause wrinkles and sun damage on your hands. I recommend reserving the gel manicure as a special treat -- and when you do get one, use a hand cream with SPF.

Cost: $1,500 to $4,500
Lasts: 5 to 7 years
Who should do it: Someone with monolids who wants bigger-looking eyes with minimal downtime.

Why you should get it: "Double eyelid surgery (or blepharoplasty) is great for making your eyes more versatile for eye makeup," says Charles S. Lee, MD, FACS, plastic surgeon in Beverly Hills. There are a variety of blepharoplasty procedures, but the least invasive and cheapest method is the non-incision stitch-only procedure. A doctor takes a needle and cuts the top layer of skin on the lid, which scabs over, resulting in the crease. Because the incision isn't dramatic, the results look extremely natural, and there's no downtime.

Know before you go: While the fold looks natural, the non-incision method is limited to creating smaller creases, so the crease will fade quickly. And while the procedure takes just 20 minutes, you still need an extremely experienced surgeon. Complications can include puffiness and bleeding.