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With the confusing array of tooth-whitening products at the drugstore, how can you figure out which will work best for you? Here, we break down what you can expect from each type of product.

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PRO: They have peroxide, which is what dentists use, and you can get similar results if you complete the regimen, usually in about 2 weeks.

CON: Each strip/tray covers only about 6 to 8 front teeth, so if you have a wide smile, some might be missed. Also, if the concentrated peroxide gets onto your gums, it can cause irritation.

EXPERT TIP: Be consistent. Most kits require that you whiten twice a day for up to two weeks, and you must stick with it or you won't get the maximum results.

WORTH IT? Absolutely. The results last for months, so twice a year will do it. (Don't use these more often or teeth and gums may become super-sensitive.)

OUR PICK: Listerine Whitening Quick Dissolving Strips, $24

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PRO: They contain hydrogen peroxide and/or carbamide peroxide, which remove surface buildup and dissolve stains.

CON: The concentration of peroxide isn't high enough to make a substantial difference  -- transforming a smile from yellow to white  -- but it can remove surface stains.

EXPERT TIP: Best for maintenance. Avoid products containing silica  -- it's a harsh abrasive that can wear down tooth enamel.

WORTH IT? Yes. If you don't want to commit to using a kit, it's an easy way to prevent future stains. Just be sure that the toothpaste you pick does contain peroxide, or you might as well be using a regular one.

OUR PICK: Colgate Simply White, $3.50

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PRO: It contains peroxide, and since it's a liquid, it can get in between teeth.

CON: You rinse only for a few minutes, so you won't get the same results as if you'd used a kit. Also, some brands contain a high percentage of alcohol, which can cause an unpleasant tingling in your gums.

EXPERT TIP: Good for a quick, subtle brightening boost.

WORTH IT? Yes, especially if you already use mouthwash. It's comparable in price, but you get the added benefit of brightening, especially between teeth.

OUR PICK: Scope White, $4.69

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PRO: Chewing gum increases the production of saliva, which helps rinse away stain-causing food particles and drinks.

CON: There's no difference between it and regular gum.

EXPERT TIP: Chewing any type of gum has the same effect as drinking a glass of water, so if you're on the go, chew on a piece after having coffee, tea, or red wine.

WORTH IT? Nope. While it's not a bad idea to keep sugar-free gum in your purse, "whitening" on the label won't make a difference.

OUR PICK: Regular gum

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* If you can, start using an at-home kit right after having your teeth professionally cleaned so you're starting with super-clean teeth. (And always brush first before using the whitening kit.)

* Since peroxide opens the pores of teeth (yes, teeth have pores), avoid eating or drinking anything dark during the two weeks of treatment and for a couple of days afterward to allow the tiny pores to close.

* Counteract yellow undertones and give the illusion of whiter teeth with new glosses tinted with pigments that make teeth look whiter. Two we like: Sally Hansen Smile Brightening Lip Treatment, $7, and Benefit California Kissin', $16; [OPENWINDOW "http://sephora.com" "sephora.com"].

* Celery, cucumbers, strawberries, grapefruit, and oranges are all natural teeth whiteners. (Who knew?)

* Check with your dentist before whitening your teeth if you're pregnant or thinking of becoming pregnant. No studies have been done on how the chemicals affect a fetus or nursing baby.