When people talk about thin hair, technically they are referring to the thickness of each strand of hair rather than the number of hairs on your head.
Thin hair actually has a different structure to thick hair. This is the science; the diameter (width) of:
In thin hair the cuticle (top layer of hair) can make up c.40% of the strand and the cortex up to 60%. Those with very thin hair don't even have a medulla.
In thick hair the cuticle will normally make up only about 10% of the strand and the cortex upto 90%.
What does this mean for you if you have thin hair?
The finer your hair more prone it is to breakage, tangles, split ends and damage.
Side note, the problem of a straight haired person with thin hair are slightly different than for us kinky-curlies:
If you have thin kinky or curly hair minimizing hair handling really helps to avoid damage and tangling. Protective styles or even growing dreadlocks / locs will really help you to gain and see your length.
If you manipulate your kinky/curly hair too often you may find that you are finding it harder to retain length than someone with courser hair just because you have a higher propensity for breakage.
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By Heather Katsonga-Woodward