Based on my experience, the product is crap and doesn't work
When I posted on Instagram that it was crap and it didn't work on myself and five other people agreed, we were tagged in a comment from HiSmiles to contact them to help us get the results. They were not interested in helping at all, they just told me how to use it (which I was doing correctly) and that was the end of that. Save your money!
I hear charcoal whitens teeth and there is a new company out there who sells it in a little tub. Give that or anything else a go!
Bottom Line: No, I would not recommend this to a friend
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