THE ULTIMATE GUIDE to Textured Hair
What determines texture?
air type, from pin-straight to tightly coiled, depends on the shape of the hair follicle, says Rolanda Wilkerson, Ph.D., principal scientist and senior director at Procter & Gamble. Straight hair emerges from a round follicle, while oval and twisted-oval follicles create wavy and curly hair. Hair thickness is also contingent on follicle size: The larger the area it grows from, the thicker the hair strand. The chemical bonds in hair influence curl pattern too. “Hair is primarily made of the protein keratin and also contains cysteine, an amino acid,” Wilkerson explains. In naturally straight hair, the cysteine groups are spread apart, so
