The problem of washing your hair before dyeing, should you wash your hair before dyeing your hair?

If your hair is oily, you should wash it so that it doesn't get colored. Others don't need to wash their hair.

1. The day before dyeing hair is not suitable for washing hair.

The day before dyeing hair is not suitable for washing hair, mainly because when we dye our hair, the cuticle of the hair layer of the hair layer will open, so that the hair dye can smoothly enter the hair, so as to achieve the effect of hair coloring. However, the scalp is the most dense place for hair follicles in the human body, and the harmful substances of hair dye can easily enter the human body through the hair follicles. Even if the hair dye does not come into direct contact with the scalp, it will form a gas through volatilization and enter the human body.

Therefore, we need to use the oil of the scalp to help us form a protective film on the surface of the scalp, so that we can block these substances that may damage our health.

2. If you really need to wash your hair before dyeing, it is recommended to wash it two to three days in advance. When washing your hair, you should be gentle and avoid fissures to avoid scratching your scalp. Otherwise, it is easy to cause head allergies when dyeing hair, or bury health risks for the body.

In order to minimize the potential damage to the body, it is recommended not to wash your hair, because after washing your hair, the sweat pores on our head are all open, and it is more likely to cause allergies when dyeing hair.

It is best not to wash your hair before dyeing your hair. It is best not to wash your hair the day before dyeing your hair, and if you want to wash your hair, it is best to wash your hair two or three days before dyeing it. This is the cause.

Therefore, the principle of hair coloring is to open the hair cuticle of the hair layer so that the color particles of the hair color can enter the hair smoothly. The scalp is the place where the most and densest hair follicles in the human body are, and the harmful substances of hair dye can easily pass through the hair follicles.

Counted in the human body divination. Even if the hair dye does not come into direct contact with the scalp, it will form a gas into the body through volatilization. Therefore, it is necessary to use the oil of the scalp to resist these harmful substances, and do not wash your hair before dyeing your hair to wash off the protective layer of these oils.

Expert doctors point out that some of the ingredients in hair dye are toxic. The main toxic substance is benzene. According to Qiu Bingyi, a former member of the Cosmetics Hygiene Standards Committee of the Ministry of Health and a professor at South China Normal University, China's current standards for m-phenylenediamine content of hair dye cosmetics are formulated according to the new EU standards in 2007, which stipulates that m-phenylenediamine shall not be added.

It is best not to dye your hair often, at most 2-3 times a year, and frequent hair dyeing with excessive silver holding will cause great damage to the hair. In addition, when dyeing your hair, avoid direct contact with the dye on your skin. If you accidentally spray it, apply it with petroleum jelly or wipe it off immediately.

According to the survey, 9 percent of the hair dyes on the market have the potential to cause cancer. Even some hair dyes that emphasize "plant essences" have the potential to cause cancer. Although this hair dye will be relatively harmless, it is impossible to be completely harmless, because it will definitely contain phenylenediamine" ingredients that make hair black.