How long does led teeth whitening last

If you want whiter teeth, you probably already know that most of what you can do at home only removes surface stains.

How long does it take to whiten teeth professionally

Changing the shade of your enamel requires bleaching. And that can mean a trip to the dentist to sit in front of that mysterious blue light. It can sound like a serious undertaking, and it costs a lot more than baking soda toothpaste, so before you get into the chair and say cheese, here's everything you need to know about bleaching your teeth.

It needs to be strong enough.

And stay on long enough.

Bleaching requires a whitening chemical—in this case, hydrogen peroxide. But it's not enough to just swipe it on. The bleach needs to remain on your teeth long enough to sink in.

"If you have a bleaching pen and you just rub it on your teeth, that's not going to stay on," says NYC-based cosmetic dentist Dr.

Brian Kantor of Lowenberg, Lituchy & Kantor.

Proper bleaching systems, like the ones described here, are designed to deliver the one-two punch of concentrated peroxide and enough time.

It won't work on all teeth.

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