What are the dangers of long-term hair dyeing

We all know that hair keeps our head warm and protects it, but now many people are making a fuss about their hair, changing the color of their hair according to their mood, but many people do not pay attention to this and only pursue temporary beauty. But we want to tell you that long-term hair dyeing is very harmful, because hair dyes contain a lot of toxic chemicals, which can cause certain damage to the scalp.

1. Hair dye can turn the white hair on people's heads black and improve people's image, so many people with white hair like to dye their hair, hoping to make themselves look younger and more beautiful. However, new scientific research has proved that chemical hair dyes not only "blacken" the surface of the hair, but are also absorbed into the cortex of the hair and eventually enter the skin through the cortex, causing harm to the human body.

2. Moreover, chemical hair dyes will inevitably dye the scalp and be directly absorbed by the hair follicles and cortex. However, dyeing your hair too frequently can cause serious harm to your health. There is a chemical substance called "phenylenediamine" in traditional hair dyes. Its role in the hair dyeing process is to open the hair scales on the surface of the hair through a chemical reaction, allowing the dye to enter the hair to achieve the purpose of coloring. Because "phenylenediamine" is called "colorant" by pesticide manufacturers, its disadvantage is that not only does it take a long time to color, at least one and a half hours each time, but "phenylenediamine" is a toxic substance that enters the human body through the roots of hair, becoming a major cause of human disease and directly endangering health. Traditional hair dyes use bleaching and dyeing technology to dye hair. Bleaching and dyeing means using chemicals to open the hair scales to allow the dyeing substances to enter the hair to achieve the dyeing purpose. People who dye their hair frequently open the hair cuticles, which often damages the hair quality. In addition, after the hair scales are opened, some chemical substances such as diphenylamine, hydroquinone, lead, mercury, etc. enter the hair, causing great damage to the hair, destroying the natural growth environment of the hair, and causing a large loss of nutrients in the hair. Oxidative hair dyes, which have always been based on aniline compounds and supplemented by phenylenediamine, p-oxyphenol and p-toluenediamine compounds, have occupied 70%-80% of the market share of the entire hair dye cosmetics.

3. Among them, p-toluenediamine has a small molecular weight and can easily penetrate into the hair marrow, causing skin allergies and symptoms such as redness, swelling, rashes, blisters, pain and itching. When hair dye is allergic, it can also induce asthma, anemia and other diseases. A few inorganic hair dyes, such as lead salts and silver salts, contain heavy metal ions that are more harmful to the human body. Once they enter human organs, they will be difficult to metabolize and excrete, which can easily cause cumulative poisoning and lead to some difficult-to-treat diseases. Among hair dyes, the most controversial issue is carcinogenicity. In 1975, American laboratories discovered that 89% of oxidative hair dyes were mutagenic. The United States once tested 169 permanent hair dyes sold by eight major companies on the market and found that 150 of them (80%) were carcinogenic. Although the U.S. Cosmetic Ingredient Review Steering Committee has pointed out after years of research that the vast majority of animal tests and epidemiological data do not support the claim that paraphenylenediamine can cause teratogenicity and carcinogenesis in humans. However, many medical experts believe that long-term and frequent use of hair dyes may increase the risk of various tumors and increase the chances of developing bladder cancer, lung cancer, breast cancer, cervical cancer, and skin cancer. Moreover, hair dyes contain phenylbutanone, which can not only cause hemolysis and leukemia, but also cause the breakage of lymphocyte chromosomes. The process by which hair dye induces cancer in the human body is very complex and lengthy. When harmful substances are absorbed into the human body through the skin and reach a certain amount, they first cause gene mutations and chromosomal abnormalities, and then cancer occurs.

The above is our detailed introduction to the hazards of long-term hair dyeing. Although hair dyeing can improve one’s personal image, chemical hair dyes will be directly absorbed into the cortex and eventually enter the skin through the cortex, endangering the body’s hyperthyroidism. Moreover, chemical hair dyes will inevitably pass through the scalp and be directly absorbed by the hair follicles and cortex, so excessive hair dyeing will cause serious harm to health.