Do you know your hair health?

Do you really know your hair?Human hair is mainly composed of a protein called keratin, and is rich in water and some can also be found in other body of trace metals and minerals.Only life some of the hair is underneath the scalp -- when the hair had grown through the scalp it becomes dead.Hair's natural luster by its own conditioner, sebum, it contains of waxes and fats and also contain a natural antiseptic that hel fight infection.Too much sebum cause oily hair, on the contrary, too little sebum will cause dry scalp.Hair can be long 12 mm per month, if he never cut hair, the hair will grow to 107 cm to start falling.In summer and go to bed at a hair to grow faster.A hair stature for up to seven years.Hair is endowed with elastic and can stretch 20% or 30% before snapping.A human hair is more robust than copper wire of the equal thickness.A combined strength of a headful of human hair can withstand 99 own weight.The scandinavians human hair thin, straight, like a baby fine hair, andCentral European hair don't fine coarse;The Indian subcontinent have coarse and tresses;Middle East people's hair is very strong;Chinese and Japanese people's hair is very straight;And Latin countries and north Africa region all hair bending and thick.