The hair is the important part of human body, when the babies are born, they are accompanying with beautiful hairs. The hair is appurtenance of skin and hairs have vital functions on the life of people.

　　Beauty Function: when you have a bright, black and graceful hair, and have them trimmed to be tidy and elegant with moderate length, you will give them a graceful, good and beautiful enjoyment when standing in front of other people; in contrast, if making your hair tangled, messy, dirty, that will give people unpleasant feeling.

　　Protective Function: Thousands of hairs covering the head can naturally form the first defensive line for head. The thick, healthy and clean hairs can prevent the head from being damaged by outside mechanical power and bacteria, so the hair has important function for improving health.

　　Sensing Function: The sensing of hair is relatively sensitive, when the human body are influenced by outer environment, whatever it is blown by wind or drenched with rain, or burned by sun or fire, the hair is the first one to sense the change of condition. The information will be sent out to transmit to brain, so people can take various precautions to protect themselves.

　　Regulative Function: The hair can carry out the function of thermoregulation. In winter, the bise is brisk, the blood vessels will be contracted, the hair can keep the head certain quantity of heat; in summer, the sun is burning, the blood vessels will be dilated, the hair will emit the heat. Therefore, the hair has dual functions to both keep temperature and dispel the heat.