The subject said that dyeing hair more than 20 times a year, regardless of the harm to the body, is unacceptable for hair loss caused by poor hair quality. Next, let's talk about the harm of hair dyeing in detail.

The principle of dyeing hair

At present, hair dyeing can be divided into high-gloss dyeing, block dyeing, stripe dyeing and spot dyeing, and their internal principles are basically the same. They all open the hair scales on the hair surface through the alkaline components in the hair dye paste, and then make artificial pigments enter the hair cortex and combine with some natural pigments to form the desired hair color.

How does dyeing hair hurt your hair?

The chemical process of hair dye changing hair color usually goes through two steps:

In this process, a lot of moisturizing ingredients will be lost, and some hair scales will be permanently damaged or not completely closed. Therefore, after dyeing, the hair will be dry, hairy and bifurcated, which will further lead to hair loss. Although some hair dyeing products claim to have added nourishing ingredients or unique maintenance techniques, the damage can not be ignored for some hair friends with poor hair quality.

Matters needing attention in dyeing hair

1, don't dye your hair repeatedly for three months.

Because the hair dye contains a decoloring agent, this ingredient is harmful to the hair scale, making it fragile and easy to break. If you dye your hair repeatedly within 3 months, the damaged hair scales will be hurt again. Over time, your hair health will be worrying.

2. Do a skin test before dyeing your hair

Whether you choose to dye your hair at home or go to a hair salon, you must have a skin test 3 hours before dyeing your hair. Test method: Drop two dyes, A and B, at the same point on the inside of the wrist and wait for natural drying. If the body becomes red, swollen and itchy during this process, then this product can no longer be used.

Don't dye your hair if you have scratches on your skin.

Remember not to wash your hair before dyeing it. First, the oil secreted by the scalp has a protective effect on the scalp, but it can avoid accidentally scratching the scalp when washing your hair. If the wound comes into contact with hair dye, it is likely to cause inflammation.

4. Apply lotion before dyeing your hair

Before dyeing your hair, you should apply lotion on the hairline and behind your ears to prevent the hair dye from polluting and damaging your skin.

5. Don't dye your hair during pregnancy and menstruation.

First of all, pregnant women and couples preparing for pregnancy are not suitable for exposure to chemical dye products, because it is not good for the fetus. Secondly, during menstruation, women's endocrine and other aspects will change. In order to prevent problems, we should also avoid dyeing our hair. In addition, patients with hypertension, heart disease, asthma and other diseases should not dye their hair.

Finally, I hope you can understand that the pursuit of beauty is everyone's right, but it must be based on health.

White hair three thousands of feet, sorrow like a beard. Stress, environment, diet, staying up late, I don't know which factor affects it. Modern people have more and more white hair.

Everyone knows that dyeing hair is not good. However, it is really unclear what harm it does to the body. Here are two examples for your reference.

A neighbor upstairs. Sister Ren is fifty-two years old this year. She began to have white hair when she was about 42 years old. Sister Ren is beautiful, fair-skinned and in good shape, so she cares more about her white hair. I dyed it very frequently at first. I heard her talk about her brother-in-law about four or five years ago. At the age of 54, leukemia was suddenly diagnosed. Her brother-in-law turned pale a few years ago, because he paid great attention to his image in the office and dyed his hair once a month. According to the doctor's analysis, the disease had a lot to do with his dyeing his hair, and he died a year later. Since then, Sister Ren has never dyed her hair.

Fan Xiao, a junior high school friend, is 70 years old like me. Her hair is gray, and her mother's hair has long been gray. Mother and daughter have been dyeing each other's hair for so many years. My mother used to work in literature and art, and she was very strict about her appearance. She dyed it once a month before she retired, and now she dyes it once every two months. Fan Xiao has long hair, and her roots should be dyed every twenty days. According to preliminary estimates, mother has been dyeing her hair for more than 30 years, and Fan Xiao will do the same for nearly 20 years. However, both mother and daughter are in good health. My mother is over 70 this year and has a strong body. She traveled all over the country with her children.

I have white hair myself, which is particularly obvious in the past two years. Pretend not to see, ignore. Someone will always remind you: Why is your hair so white at a young age? It's harsh Women always want to be beautiful and always have a hard time with themselves. So I dyed it, and it was my husband who picked it up and compared it on the Internet. It was pure plant, with high sales volume and good effect, and the evaluation was ammonia-free. In two years, I have changed countless hair dyeing brands.

I cheer myself up every day: I don't dye it so often, should I be okay? In fact, I still have no bottom in my heart. How much harm does dyeing hair do to the body? It still varies from person to person. After all, there are individual differences.

With the rapid development of science and technology, when can we really develop a non-toxic and harmless hair dye? I'll wait and see

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Hair dye is definitely harmful to the body, carcinogenic and harmful to hair quality, so try not to use it frequently, and it is advisable not to exceed twice a year at most. 1) Precautions for dyeing hair: Check the scalp before dyeing hair. If there are bruises, boils and dermatitis, it is not advisable to dye your hair. People with high blood pressure, heart disease, pregnancy and childbirth are not allowed to dye their hair. Novices should do a skin allergy test: apply a little hair dye to the skin inside the arm or behind the ear, and there will be no abnormal reactions such as blisters and burning sensation within two days. Wear gloves when dyeing hair to avoid skin contact with hair dye. If it is eye drops or skin drops, please rinse it repeatedly with clear water. Wash your hair and scalp thoroughly after dyeing, and don't scratch hard when washing to avoid scalp injury and poisoning. The interval between dyeing should be less or wider, and the interval between dyeing should be at least one month. If color dyeing is carried out, color dyes synthesized by natural plants should be selected. Don't dye hair, perm, bleach and straighten at the same time, so as not to damage your hair. Never dye your eyebrows and eyelashes with hair dye. Dye your hair carefully and don't get sick. Dyeing hair may cause hair dermatitis. If you have symptoms such as redness, edema, blisters, blisters, erosion and ulcers on the day or a few days after dyeing your hair, you may have this disease. Hair dye dermatitis can make people feel itchy and burning, and even have symptoms such as chills, fever, nausea, headache, dizziness and conjunctival edema. Repeated dermatitis will eventually cause exfoliative dermatitis. After some inflammation disappears, dermatitis can occur again when dyeing hair. 2) Preventive measures L. People with allergic history should be careful when dyeing their hair. 2. Don't dye your hair after dyeing dermatitis. 3. Do not use hydrogen peroxide or other solvents to remove hair dye. This method is ineffective and harmful. 4. Don't use hair dyes frequently for a long time, especially chemically synthesized hair dyes. 5. Choosing the high-quality products produced by regular manufacturers is not harmful to health. In addition, if you have hair dye dermatitis, remember to go to the hospital in time to prevent the disease from getting worse and spreading to the face, neck, eyelids and upper chest, which will bring further inconvenience to life. 3) Hair dyeing in MengMeng is harmful to health. Since ancient times, people in China have regarded black hair as beauty. Nowadays, no matter men, women and children, as long as silver silk climbs up, they will be afraid of being regarded as a sign of aging and dyeing their hair repeatedly for years. You know, all kinds of hair dyes contain dozens of chemical components. According to the detection of 100 hair dyes by relevant departments, nearly 90% of hair dyes contain toxic chemicals such as nitrobenzene and aniline, which are easily absorbed by the skin and harmful to human body. Medical experts point out that if hair dye is used for a long time, as long as 1% is absorbed by the skin and enters the human body, it will accumulate poisoning, in which chemical substances combine with some cells, DNA in the nucleus is damaged, causing cell mutation, inducing skin cancer, bladder cancer, autologous blood disease and so on. So experts warned against "starting the disease from scratch". Research by the American Cancer Society shows that women who use hair dyes have a 70% increased risk of lymphoma. A survey was conducted on10.3 million women who had dyed their hair, and it was found that the number of women suffering from leukemia was 3.8 times that of women who did not dye their hair. Leukemia caused by hair dye has an increasing trend, and the medical profession specially named it hair dye leukemia to remind people to pay attention. There are also many reports in China medical journals that hair dyes cause leukemia, skin cancer and bladder cancer. Six leukemia patients (5 females, 5 males 1 case) caused by frequent hair dyeing were admitted to the First Hospital of Harbin. The hematology department of Beijing Friendship Hospital found that many middle-aged and elderly leukemia patients have a history of dyeing their hair. Some imported hair dyes also contain lead acetate, and the lead content is 5- 10 times that of household paints and pigments. After lead enters the human body, it is difficult to excrete it, causing cumulative poisoning, such as dizziness, headache, fatigue, numbness of limbs, leg cramps, abdominal pain and a series of lead poisoning symptoms, and entering the liver, kidney and brain marrow, destroying the functions of these organs, and seriously losing labor. I advise you to enhance your awareness of self-protection, and also weigh the advantages and disadvantages of less hair dyeing and beauty, so as not to damage your health, especially for patients with allergies and blood diseases, pregnant women and lactating women, so as not to harm the next generation. 4) Be alert to hair dye dermatitis. Now, people's living standards have improved, and the elderly are willing to dye their white hair into black hair and look younger; Young people are willing to dye their black hair into colorful hair, which makes them more lively and energetic. But remind friends who have dyed their hair to be alert to the occurrence of hair dermatitis. So, what is hair dye dermatitis and what are its symptoms? Hair dye dermatitis is a kind of contact dermatitis caused by hair dye. Why do some people get hair dermatitis after dyeing their hair, while others don't? This is related to p-phenylenediamine, which is widely used in hair dyes. P-phenylenediamine is one of the common and powerful allergens, and it is the main allergen that causes hair dye dermatitis. People with allergies are allergic to this substance, and hair dermatitis only occurs when dyeing hair; If you are not allergic to p-phenylenediamine, don't worry. As it turns out, many people dye their hair, but few people dye their hair and get dermatitis.