Strips

why it works: These trays are custom fit to keep the high dose of peroxide on your teeth so it won't spill onto your gums.

time it takes: 30 minutes a day for two weeks (at home).

what you'll get: Teeth that are six to eight shades whiter.

what it costs: $3oo-$soo

NOTE: You'll have these trays forever so you can whiten your teeth again later.

why it works: These professional-grade whitening strips have 10 times more peroxide than the drugstore versions.

time it takes: 30 minutes a day for 10 days (at home).

what you'll get: Teeth that are seven to eight shades whiter.

NOTE: Your dentist may not offer this new method, but chances are she has the trays.

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