Do I apply the pen on the tray or on my teeth? June 07, 2023 13:30 Updated On your teeth. Related articles Am I allowed to eat or drink after application? How do I ensure proper fit? What is the whitening ingredient in the pen? How does it work? Is the device safe for use? Will it damage my teeth? I used up the pen that came with the device. How can I get a refill? Comments 0 comments Article is closed for comments.
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