How is hair type determined?

We all have different hair types. 
While they can be simply categorized into four types, according to the ‘Andre Walker Hair Typing System’, there are actually ten types. This difference arises because the shape of each person’s hair follicle varies.
Since the shape of the hair follicle, the organ that produces hair, differs from person to person, the direction and shape in which hair grows also change. You can clearly see this by zooming in on the cross-section of the hair.

• Straight hair: Hair that grows straight and smooth. The hair follicle is in a vertical shape, so the hair cross-section is close to round.
• Wavy hair: Hair with natural waves. The hair follicle is slightly tilted compared to straight hair, so the hair cross-section is more oval.
• Curly hair: Hair with distinct curls. The hair follicle lies at an angle, with the hair cross-section being flat.
• Coily hair: Hair with strong and very defined curls. The hair follicle is even more tilted, and the hair cross-section is very flat.

So, why do hair follicles have different shapes? The answer lies in our genes.
During fetal development, the genes that regulate the early stages of hair follicle formation determine the spacing and distribution of the follicles. The number of hair follicles formed during this period does not change after birth. Whether hair appears thick or sparse is not due to the number of hair follicles, but rather the number and thickness of the hairs growing from those follicles.
However, in some cases, the shape of the follicles or the thickness of the hair may slightly change over time due to hormonal influences.

Choosing the right care method for your hair type is essential for maintaining healthy hair.
At the same time, understanding the basic science of the scalp is a great starting point for selecting the products that are right for you.
Ultimately, no matter the type, prioritizing scalp and hair health will open the way to smarter hair care and can be an effective solution for everyone.