There is no perfect answer by now as to why some textures of hair are straight, wavy or curly. The debate within the scientific community attributes it to this:

Distribution of ortho- and para-cortex

Shape of hair bulb

Influence of Inner Root Sheet

Diameter of hair with one side of the hair bulb having a quicker cell division than the other

The facts:

Asian hair is rounded and straight

Caucasian hair shows a round to oval diameter and is straight but also tends to be wavy and curly

African hair has a very elliptic diameter and creates very tight curls

Learn more about Hair Facts here.

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