Is dyeing hair harmful to human body? Ask god for help.

Of course it's harmful. The doctor suggested that you should not dye your hair more than twice a year. Even so, it doesn't mean that it will be okay twice a year, just that the consequences are not so serious. I dyed it once, and a lot of red beans immediately grew on my face, but I couldn't get rid of it. I regret it. First, oxidant is an important part of hair dye, which is extremely destructive to hair keratin and easy to cause damage to hair. Regular use will make hair dull, fragile, split and easy to fall off. Secondly, most permanent hair dyes use aniline dye intermediates, which are highly irritating and toxic in cosmetic raw materials. No wonder some people have allergies and even dizziness and nausea when dyeing their hair. Thirdly, hair dye consists of two components. When in use, mix them evenly and then apply them to the hair. I don't know that a chemical reaction took place at the moment of uniform mixing, resulting in a high concentration of harmful gas-dioxin. Dioxin is a strong carcinogen recognized by WHO. It enters the body through the respiratory tract and stays in the muscle for a long time, which is difficult to decompose and interferes with human endocrine, estrogen and thyroid hormone. Long-term exposure will lead to genetic variation and deformity of human body and induce diseases such as cancer. Therefore, it is scientific to be pregnant and pregnant women not to dye their hair. If there is, it is necessary to prevent it. How can we stay away from these hazards to the maximum extent? First, consumers should try to choose a hairdressing salon with good ventilation environment; Second, when buying hair dyeing products, you should buy products from well-known regular manufacturers, and check whether the products have product name, ingredients, instructions for use, production date, expiration date, net content, origin, name, address and telephone number of the production unit. Marked with standardized Chinese characters. Some products with trademarks of Guangming (Beijing), Zhanghua (Zhejiang), Biaomei (Guangzhou), Shuerfa (Shanghai) and Hyundai (Shunde) are all qualified products randomly selected by AQSIQ and recommended for use. Third, the key to deep care after dyeing is baking oil. Shampoo only cleans the hair and protects the cleanliness and health of the head skin; Hair conditioner can provide daily nutrition and moisten hair; Moreover, frequent baking of oil can deeply nourish and care the hair. It's best to do it once a week. The harm of dyeing hair mainly includes the following aspects: 1. Skin allergic reaction is the most common adverse reaction of hair dyeing. Some people may not have allergic reactions at the beginning of dyeing their hair, but they may have allergic reactions after dyeing for several times. The longer the time, the higher the chance of allergic reaction. 2. Causes changes in hair quality. The dyeing process will affect the moisture imbalance in hair, and a large number of protein will be denatured and reduced. As a result, the hair becomes brittle, the fiber breaks and the natural beauty of softness, tenacity and luster is lost. The more times you dye your hair, the more serious the injury. 3. Causes hair to fall off. Acute and chronic stimulation of hair dye will cause inflammatory reaction of scalp and hair follicle, which will cause hair follicle atrophy after a long time, and the hair will turn from thick to thin and finally fall off. 4. Absorbing toxic substances damages liver and kidney function. More common in metal hair dyes and some synthetic organic hair dyes, such as lead acetate and silver nitrate, benzene, naphthalene, phenols and so on. To prevent the potential harm of hair dyeing, we should pay attention to the following points: 1. Try to reduce the number of hair dyes. 2. Choose a good hair dye. Don't apply hair dye to the skin when dyeing hair. In order to prevent it from smearing on your skin, you should first apply a layer of vaseline to your skin for protection. 4. Don't dye your hair when the scalp is inflamed and damaged. Damaged skin will increase the absorption of hair dye. For people with special physique, no matter how safe the hair dye is, it may be potentially harmful to him or her, so it is necessary to have a regular physical examination.