If hair was really dead to the body, then how does it come to know that it has been cut, and responds by growing it again to a specific length? Once the specific length has been attained, further growth ceases. Thus, undoubtedly, the body is well aware of the condition of hair, cut or uncut, even up to its tip! This is a sure sign of life.
By cutting our hair, we are actually putting extra load on our body, as the energy and the raw materials (protein, etc.) required for growing hair would be far greater as compared to the amount required for their maintenance only. Further, the base of every follicle bulges out forming an inverted cup, which receives blood capillaries for nourishment of hair. An oil gland, known as sebaceous gland, opens into every hair follicle, the secretion of which lubricates the hair. In addition, the hair like any other living organ of the body, responds to aging, in its variations in length, denseness of growth, and graying. The condition of the health of a person is also reflected in the hair and in its luster and shine.
Lack of sensation in hair along its shaft (visible part of hair) is no indication of it lacking in life. There is a group of animals (phylum Porifera), which do not possess a nervous system at all. A blow to any part of their body produces no response whatsoever. Do we call these animals lifeless? Similarly, most plants do not show any sensation either but they are not lifeless. Hair are living part of our body and should remain uncut and clean all the time.
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