Margarita

We appologize for the delay on this. We heard back from Crest and here is what they stated:

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Wear the strips for 1hour.
After 1hour, press and hold the two buttons on the light simultaneously to turn on the light then release. Then place the light on the top strip until the light automatically turns off after a few minutes. Repeat on the bottom teeth.
Remove the light and strips when finished.
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Our personal opinion, we'd have little faith that the use of the light plays a significant role in the whitening process.

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