Yunhee Kim

GoSMILE Smile Whitening System 

“Easy and fun to use,” these were a hit with impatient testers, who began to see a difference right away (just rub the end of the swab on each tooth).

Time commitment:
Two minutes to apply, plus 20 minutes without eating or drinking, twice a day for a week.

To buy:
$89, gosmile.com.

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