Glo Solo Teeth Whitening, $45 Glo Solo is a gel -- similar to the kind you put in trays -- but there's no uncomfortable "fitted" tray required. Instead, the minty gel adheres directly to your teeth. You put it on twice a day after brushing, and you leave it on for 15 minutes, then rinse. And the system lasts for two weeks. The only downside? You can't eat or drink while your teeth are gellin', and talking is a little awkward -- a tiny inconvenience for noticeably whiter teeth.
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