Hair grows from hair follicles in the scalp, and its main component is keratin. There are many uneven hair scales on each hair. When the hair scales are damaged, they will lift up, which will increase the friction between the hairs and make the hair not combed smoothly. More friction will aggravate the damage of the hair scales. Hair, like nails, is made of hardened keratin and is lifeless, so it is impossible to have a protective mechanism that automatically produces a sebum film like skin.
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