If you like (or don’t like) your curly hair, you can thank (or blame), your genes, your shampoo, your climate and your hairdresser. But the fact is they’re all bit players. The real determinant of ...

Hair porosity is your hair’s ability to absorb and retain moisture. This affects how well oils and moisture pass in and out of the outermost layer of your hair, known as the cuticle. To understand the ...