I received the MOON teeth whitening pen at a discount in exchange for my honest opinion. When I first used the pen, I had to click it a few times to get started. I found the brush handy at the end to apply the gel to the teeth. I've used the pen 3 times and haven't noticed a difference yet, but I will continue to use it. When I first used it, my gums hurt a little; However, I did not experience this when using it later. While the vanilla mint flavor wasn't terrible, it was a bit strong. Overall, the pen has its pros and cons, but I would still recommend it.
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