Fits my mouth perfectly. My teeth are a bit whiter after 2 uses of Crest White Strips, it's hard to say if it works because they always combine with another product (white strips) but we all know that before we buy! I was a little sad that it is not suitable for my Android. I have ZTE Max Pro (2017) Newer Android, 4g. The USB port works and I connect it to my phone charger.
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