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mathatron
The average human head (an average scalp measures approximately 120 square inches or 770 cm²) has about 100,000 hair follicles (Gray 2003). Each follicle can grow about 20 individual hairs in a person's lifetime (About 2007). Average hair loss is around 100 strands a day.
cyaransteenberg

Obviously, the number varies from person to person, but in general the answer is that the human head has about 100,000 strands of hair.

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