For some elderly people, there will be a lot of gray hair on the head, so they will take regular hair dyeing to dye their hair black to achieve the effect of making themselves more youthful.
For some younger people, they like to dye their hair in a variety of colors to show their personality. Hair coloring is a modern makeup technique that can play a role in adding points to the image.
But many people believe that hair coloring is a dangerous behavior, and long-term hair coloring is carcinogenic. So, is this statement true?
The causes of cancer are very complex, and the process is relatively long, due to the combination of endogenous and exogenous factors. Therefore, long-term hair coloring will not directly lead to cancer, but it will increase the probability of cancer.
In addition, most people use a chemical hair dye, which is a combination of various chemical components, such as phenylenediamine.
Among permanent hair dyes, the content of phenylenediamine reached a maximum of 7.5%, and among semi-permanent hair dyes, the content of phenylenediamine reached 5.5%. Even the so-called all-natural hair dye, the content of phenylenediamine has reached 0.5%.
Phenylenediamine is a colorant, which is a raw material that must be used in hair dyes, but it is also an internationally recognized carcinogen. Once it enters the human body, it is almost difficult to be excreted, and it will always remain in various organs in the body.
If you dye your hair for a long time, it will lead to too many carcinogens in the organs, and the probability of cancer will increase. In particular, the incidence of breast, uterine, bladder, and brain cancers increases.
So, how often is it safer to dye your hair?
From the perspective of health and safety, it is safest not to dye your hair. But for people who have to dye their hair because of job requirements, or other factors, it is best to dye their hair once a year, not more than twice.
Otherwise, the phenylenediamine and other heavy metal particles in the hair dye will enter the human blood circulation through the scalp, increasing the probability of allergies and cancer.
What should I remember to keep in mind for safe hair coloring?
1. Avoid direct contact with the scalp
When coloring hair, be sure not to let the hair dye come into direct contact with the scalp, and the hair dye can be close to the scalp at a distance of 1cm.
2. Stay in hair for a long time
The stay time of hair dye on the hair must be strictly controlled and should be used according to the instructions of the hair dye. If you stay on your hair for too long, the dye ingredients can pass through the scalp into the circulatory system.
3. Avoid high temperature heating
Proper heating can be done when coloring hair, but be sure to control the heating temperature. If the temperature is too high, it will not only cause the hair texture to be affected, but also accelerate the absorption of these chemicals by the scalp.
4. Wash off the hair dye thoroughly
When your hair is colored, be sure to quickly and thoroughly clean the remaining dye from your hair. If it is not cleaned, it will stay on the scalp and hair for a long time, and the harm to the body is relatively large.
All in all, long-term hair coloring will not directly lead to cancer, but it will increase the risk of cancer, especially the incidence of cancers such as uterine cancer and breast cancer will be relatively increased, so no group of people can appear frequent and long-term hair coloring behavior.
If you have to dye your hair, you can dye your hair once a year, not more than twice. And when dyeing your hair, you should also keep the above 4 points in mind.
In addition, if you are a minor, an allergic constitution, a pregnant woman, a lactating woman, or some chronic disease, then you must not dye your hair, otherwise it will cause great harm to your health.