Why does hair turn grey?

People apply dye for their hair to not look greyish or white! But  have you ever wondered why hair turn grey hair?

To understand the reason, let us look at a single strand of hair. It is made up of two parts-the root which lies below our scalp, and the shaft - that is the part you see- which grows above the Scalp. The root of every strand of hair is surrounded by a bulb shaped structure called the hair follicle. Each hair follicle contains a certain number of pigment cells.

These pigment cells continuously produce a chemical called melanin, which gives the growing shaft of hair its colour. As the hair is being formed, melanin is injected into hair cells containing keratin. Keratin is the protein that makes up our hair, skin, and nails. Throughout the years, melanocytes continue to inject pigment into the hair’s keratin, giving it a colorful hue.  

As we get older, the pigment cells in our hair follicles gradually die. When there are fewer pigment cells in a hair follicle, that strand of hair will no longer contain as much melanin, and will lose its colour. It will become gray, silver, or white, as it grows. Most of us will start having gray hair around the same age that our parents or grandparents first did ... so you still have plenty of time left before you start getting grey hair!

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