Understand your hair structure
As we know human body are mainly made up of tough protein, same goes to our hair. However, our hair fibers have a structure that consists of several different layer. There are three different layers in our hair, staring from the outer layer which is the first layer call cuticle.
Cuticle is the outermost layer protects the cortex a hard shingle-like layer of overlapping cells, like scales. The second layer or the middle layer of the hair which is cortex, is the primary source of mechanical strength and water uptake. The cortex contains melanin, which colours and fiber and determines the colour of your hair. The shape of these follicles determines the shape of the cortex, and the shape of the fiber relates to how straight or curly the hair is. Beside, that the most inner layer also know as the 3rd layer which is medulla. The medulla is not always present and open unstructured region, it may even be absent especially in fine or light blond hair.