There are several chemical hair straightening products. Apart from the chemical products from the Afro shop and the CHI method, there are other keratin treatments for curly hair to choose from. In contrast to other permanent hair straighteners, this one is gentle and, in terms of the ingredients of the smoothing cream, is based on a natural protein that is already present in human hair and nails. Keratin hair straightening originally comes from Brazil. The keratin is able to straighten hair because the hair itself consists mainly of keratin. Keratin is a protein that makes hair elastic and resistant to cold and heat. This is exactly what keratin hair treatment takes advantage of. The keratin, with which the hair is now treated, penetrates deep into the cuticle. It seals the hair naturally. The hair is permanently straightened and cracks and broken areas are filled, which is why the hair is also supple.