"The one I like most is called Zoom," says Kohli. "It's an in-house treatment and only takes an hour of chair time as it's four treatments back to back for 15 minutes each."

The only drawback? Well, it'll cost a pretty penny: The average cost of this treatment is about $500 (which includes the take-home pack for aftercare). And since it's a cosmetic procedure, your health insurance probably won't cover it.

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About six months, according to Kohli. Depending on what you consume, that is: If you love red wine, cola, anything with artificial colorants that can stain your teeth, then you might need touch ups sooner, she explains.

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Well, Kohli says that most dentists will suggest taking an anti-inflammatory an hour before or after the treatment, so there are no "zings of sensitivity," as she puts it. But you also need to be very careful of what you consume for the next 48 hours after the treatment, since "the teeth are dehydrated and the enamel rods are opened" from the treatment.

Bottom line? Teeth whitening doesn't have to be a big deal — but you should still be careful when doing it and heed your dentist's advice.

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