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Keratin Hair Treatment Kit eBay. Updated January 2018 Formaldehyde in hair straightening products Hair Straightening Products Containing Formaldehyde . Keratin Treatment in Mint, Chocolateâ€¦ chocolate keratin treatment instructions AFTERCARE INSTRUCTIONS DOâ€™S AND DONâ€™Tâ€™S - Simply Smooth Keratin Service DOâ€™s DONâ€™T wash the hair for three days so that the treatment can fully develop..