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How does healthy hair grow?
There are three main phases of the individual healthy hair growth cycle: anagen, catagen, and telogen. Anagen is the active hair growth phase in the hair growth cycle. It lasts for about 4 to 5 years. In the 5th year, the catagen stage evolves, a period of regression of the hair follicle. Ultimately, the hair falls out at a resting period, called the telogen stage. By the 6th year, new hairs grow and the hair growth cycle begins again. The number of hair on a healthy scalp is approximately 100,000. On a normal human scalp about 90 percent of follicles is continually in the anagen stage of the hair growth stage. The average rate of hair fiber growth is around half an inch per month. This rate varies depending upon the hair follicle and the age of the individual.
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