2, phenylenediamine is a nationally recognized carcinogen, which is harmful to the human body, but eating hair dye containing phenylenediamine may not cause cancer, depending on your physical condition.
3, phenylenediamine is easy to cause skin allergies, which will generally make the skin red, rash, itchy and painful, and in severe cases, it will kill people. Therefore, it is best to do an allergy test before dyeing your hair, and it is best not to dye your hair if you have a history of allergies.
So, what should people do if they can't avoid dyeing their hair? Specific practices are as follows:
1, choose a regular hair dye. Inferior hair dyes contain a lot of toxic substances. If used on the head, toxic substances will enter the blood vessels of the cerebral cortex with hair follicles, which will be harmful to the development of the brain for a long time and even cause cell canceration.
2. You can buy your own regular hair dye and ask your family to help you dye your hair at home. Because you don't pay special attention to scalp problems when dyeing your hair in a barber shop, you might as well follow the correct steps at home.
3. Confirm whether you are allergic before dyeing your hair, and also check whether there is a wound on your head, otherwise the hair dye will cause inflammation of the wound.
If you dye your hair at home, you must pay attention to the following questions:
1, wear rubber gloves when dyeing hair, which not only ensures cleanliness, but also prevents toxic substances from entering capillaries with the skin.
2. Leave at least one centimeter when dyeing your hair. There is also a little toxic substance in the hair dye to reduce the contact of harmful substances with the scalp.
3. Wash your hair many times after dyeing your hair to wash off the remaining toxic substances.
Try not to dye your hair more than twice a year. If you dye your hair often, it will not only damage your hair quality, but also increase the number of times you are exposed to toxic substances, and people who dye too much hair are prone to hair loss.
Remember not to wash your hair the day before dyeing, because there is a layer of oil on your hair to protect your scalp. If you wash your hair, you will wash off the grease and do harm to your scalp.
In short, from the health point of view, try to dye your hair as little as possible. Some people often dye their hair because of their good health, but some people have sensitive skin and are not suitable for dyeing their hair, so it is best not to dye their hair when it is not necessary.