PROFESIONAL USE Is a professional straightening treatment that transforms damaged hair, restoring and boosting collagen protein. Straightening treatment that transforms damaged hair, restoring and boosting collagen protein. APPLICATION PROCESS: Wash hair with the Collagen Filler Shampoo thoroughly to ensure hair is clean. Towel-dry hair, leaving it moist. Pour the product into a bowl. Divide the hair into sections. Apply Collagen Filler Liss section by section with a brush, starting with the section of the neck and half inch away from the scalp. Saturate the hair with the product. Let it work following instructions:
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