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The most perfect product in the world is worthless, if you are not taught how to use it properly.
In my 8 years of being a hairstylist, and having a 100% Satisfaction Guarantee on my retail, I have never had to return or exchange a product. I pride myself on asking all the questions necessary to prescribe the right regimen and walk them through how to use it.
The two times someone asked about why a product wasn't working right was entirely user error.