Hair is one of the major contributors that impart beauty to any individual. Hair color is also important and with little exception, black is the preferred color for almost all regardless of the region. The ethnic group is also a key factor governing the hair color.

The hair color is mainly controlled by a specific pigment present in the hair which is called melanin. The difference of the white and grey hair is still a debate and there are two opinions governing the debates.

One group says that the difference of the color is physiological and is a usual behavior which is because of the lack of melanin pigment in the hair follicles. However the other group claims pathological process as a reasons of changes in hair colour. 

Though initially the people were not concerned about the hair  colour, but nowadays the grey and white hair is being complained by teenagers and this was not the case observed till a few decades ago and very few reports are there which show the teenager’s hair getting white or grey before that.

Almost all age groups and gender are affected by this which alarms the experts in the field and nowadays the research has been going on to understand the etiology and find out the therapeutic intervention against it.