Hair grows from hair follicles in the scalp, and the main component is keratin. Each hair has many jagged scales on it. When the hair scales are damaged, they will warp, which will increase the friction between the hairs, and the hair is not combed smoothly, and more friction will aggravate the damage of the hair scales. Hair, like nails, is hardened keratin and is lifeless, so it is impossible to have a protective mechanism that automatically produces a sebum membrane like skin.
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