Question

how much hair is present in our head

Answer 1

An average human has approximately 100,000 hair follicles present on their scalp.  

An average scalp has the dimension of about 750 square centimetres.

Each of these 100,000 follicles can produce nearly 100 hairs in a life cycle of a human.

Along with the growth of the hair, as many as 100 hair strands are lost everyday in an average human.