Hair can not only keep the head warm, but also play a protective role, and now it also plays a role in setting off and beautifying the face. So many people do not hesitate to make a fuss about their hair to make themselves more conspicuous. Perm and hair dyeing are the most popular and fashionable representatives. Nowadays, there are many young ladies who love beauty and like to have their hair permed crooked, which they think is fashionable. Many young people dye their hair colorful, while old people dye their white hair black to show their youth. But what kind of influence will naturally generated hair have in the process of dyeing and perm? Is dyeing harmful to hair and body? Who is not suitable for perm and hair dyeing? To understand that our hair is horny, protein is made up of a series of amino acids. This macromolecule is like a long chain, and amino acid is one of the links. One of the most abundant amino acids in hair is called cysteine. Two cysteines are inserted in different places for sparsity? Sulfur bridges form cystine. These cystines are very similar to small springs, giving hair a certain shape and elasticity. Principle and Harm of Perm The ammonium sulfate (alkaline) in the special lotion for perm enters the cortex through the hair scales on the hair surface, which changes the protein chain structure of hair and forms curly hair. Perm is generally made by disassembling the small spring of cystine with reducing chemicals to make cystine hydrophobic. The sulfur bridge bond breaks and becomes two cysteines. At this time, the amino acid chain of hair will be loosened and rolled into a certain waveform, which is at the mercy of others. Then, a fixing agent is used to make the cysteine of the disconnected small spring two combination together to form a new spring and fix the hairstyle. In the process of perming, the alkaline components and oxidation in the liquid medicine will destroy the scales on the hair surface. If the internal structure of hair is not protected, it will cause the loss of water and nutrients inside, which is harmful to hair, scalp and hair follicles, and will denature the keratin of hair more or less, making hair easy to turn yellow, brittle, dull and inelastic. Experts believe that perm should not be too frequent, not more than four times a year; Perm for pregnant women will affect the health of the fetus and should not be permed; The little girl's scalp is delicate, and it is easy to break the scalp by perm and infect bacteria; People with dry scalp should not have a perm often. Therefore, perming should be carried out according to your own actual situation. The principle and harm of dyeing hair is to use the alkaline components in the dye paste to make the hair scales on the hair surface open (the scales on the hair open when exposed to alkali), and the artificial pigments enter the cortex of the hair and combine with some natural pigments to form the desired color. When dyeing hair, the ammonia in the dye paste has a strong destructive effect on the hair scales on the hair surface. If it is not properly maintained, it will cause hair scales to fall off, lose water, be rough, have burrs, and lack luster and elasticity. It is a lot of people's troubles that the dyed hair is dull or the color is difficult to maintain. Experts remind that no matter what kind of hair dye or its products are dyed, they generally contain toxic aromatic chemicals. Long-term use may damage the hematopoietic system of the body, or cause fetal malformation in pregnant women, and even lead to dermatitis, skin redness, itching, ulceration and so on. For the sake of health, it is natural to dye as little as possible or not. Many people have allergic reactions to chemicals used for dyeing hair and perming hair, such as rash, dizziness and even redness and swelling of the skin. Therefore, we should pay special attention to prevent this allergic phenomenon. We can try it on the skin first. If you have redness and allergies, don't dye it. Of course there are disadvantages, treating cancer! ! Be careful when dyeing your hair, otherwise it will be harmful to your health. Nowadays, fashionistas with rich hair colors such as brown, burgundy, gold, grape purple, black and white will often come to you. But be careful, beautiful colored hair may be harmful to health. It is understood that chemical dyes are synthesized by chemical methods from petroleum and other products. Although these dyes are attractive in color, some of them are carcinogenic and contain heavy metal elements harmful to human body, such as lead, nickel and mercury. Substances that can cause blood system diseases include benzene and its derivatives; Hair dye, mercury, etc. Sometimes it can cause diseases of hematopoietic system. Hair dye is one of the causes of blood diseases. The chemicals in the dye are smeared on the scalp, heated and infiltrated into the skin, and enter the systemic circulation with the blood, affecting the hematopoietic system, and may even cause malignant tumors in the hematopoietic system such as leukemia. In addition to blood diseases, hair dyes, like most cosmetics, may cause allergic diseases such as allergies, which are manifested as erythema, papules, local itching and pain on the scalp and its surrounding skin. Hair dyeing needs to be cautious, especially for the following people: people with allergies; Abnormal hemogram; People with a history of consanguinity; People with hepatic and renal insufficiency. Because liver and kidney are organs for detoxification, such as liver and kidney deficiency, it is easy to lead to the accumulation of toxic substances.

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