The number of hairs in a normal person is usually around 100,000 to 150,000, with a growth life of 2 to 6 years. After this, there is a short rest period of about 3 months. During these 3 months, the hair stops growing, the tips split, and the hair in the hair follicle slowly moves upward and easily falls out when washing and combing the hair. Normally, about 15% of the hair on the top of the head is in a resting state, and they often fall out when combing and washing, and it is normal to shed about 50 to 100 roots per day. However, due to the lack of care knowledge, often cause the hair growth period is shortened, early shedding, or like a handful of hay. Here are some hair care tips for you: ① hair demarcation line should not be unchanged for a long time. Because the hair demarcation line of the scalp is directly exposed to the sun, easy to sunburn, if you do not change the position for a long time, it is easy to lose hair, revealing a scalp. Often change the position of the hairline, not only can prevent this phenomenon, but also can make the hair even light. ② Reasonable choice of hairbrush. It is best not to use nylon and plastic hairbrush. Because of their friction with the hair, will produce electrostatic effect, static electricity will be transmitted to the root of the hair by the hair shaft, to reach the important parts of the hair development - hair papilla, and with the hair of the anisotropic phase of the role of electricity, causing discharge, so that the root of the hair atrophy. Long-term, will cause hair loss. ③ Do not perm too many times. Because the perm solution on the hair as much as the human body for major surgery. In the life of hair growth, perm two or three times hair is not much impact, such as perm too hard, will make the hair hurt "vitality". In addition, perm after a week to pay close attention to shampooing, combing hair, otherwise, hair easy to break, yellow. ④ with conditioner, do not vigorously to the scalp on the rub, but should be to the hair dry, especially the tip of the hair part of the rub. Because the conditioner is to add supplemental moisture and oil to each hair to make it penetrate. It should be rubbed to the tip of the hair part fully first, and then to the direction of the hair root, but do not rub to the root of the hair, sebum secretion is too much people, should avoid rubbing to the scalp, because the oil is absorbed too much, it will be oily. ⑤ After washing your hair, use a dry towel to soak up as much moisture as possible, then use a hair dryer to blow it until it is half dry, then let it dry naturally. If you don't blow it to half-dry and wait for it to dry naturally, then hair that has been wet for a long time will easily harbor bacteria, produce odors, and develop phenomena such as itchy head and raw scalp. Especially people with long hair and many hairs should pay more attention to it. (6) for women, if the life is relatively busy and maintain a moderate amount of exercise, hair will be more colorful black, full of vitality; if the hair and then get the proper nutrition, growth will be more dense. But men are just the opposite, the busier they are, the more stressful their lives, the higher the chance of hair loss, the more obvious the rate of hair loss on the forehead. The reason for this is due to the excess of androgens that lead to hair loss. Therefore, no matter men or women, they should develop good living habits. (7) pay attention to the nutrition of the diet, do not eat, do not drink too much alcohol, to always insist on eating more cereals, vegetables, fruits, fish and drink more water, eat less sweets. (8) Comb your hair the appropriate number of times a day, not too much, not too hard. In your spare time, gently massage your scalp with your fingertips to enhance blood circulation.