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The more damage the hair sustains, the shorter the lifespan of the artificial hair. Most human hair extensions can be treated as real hair, albeit more gently. *Since human hair extensions are usually heavily processed to achieve uniform color and texture, a mild shampoo is recommended, along with a light conditioner to reduce tangling.
This measurement is not precise because human hair varies in diameter, ranging anywhere from 17 μm to 181 μm [millionths of a metre] [8] One nominal value often chosen is 75 micrometres (0.0030 in), [5] but this – like other measures based upon such highly variable natural objects, including the barleycorn [9] – is subject to a fair degree of imprecision.
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In 2015, initial trials for human hair were successful in generating new follicles, [7] but the hairs grew in varying directions. In 2016, scientists in Japan announced they had successfully grown human skin in a lab. [8] The skin was created using induced pluripotent stem cells, and when implanted in a mouse, the skin grew hairs successfully.
Human scalp hair grows on average about one eighth inch per week or one half inch per month. [35] Most clipper guards are numbered in eighths of an inch. The number of the guard denotes the number of weeks of hair growth left on the scalp when a clipper with a certain numbered guard is guided over the head with the guard in contact with the scalp.
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