Hair dyeing one month before pregnancy has a certain impact on women, the specific impact has the following aspects: First, if women do not often dye their hair, only in the first month of pregnancy, the impact on women is relatively small, such as the possible irritating effect on the female head skin, may also cause women allergies without causing adverse effects on the fetus in the body. Secondly, if the hair is often dyed and dyed a month before pregnancy, the effect will be greater, because there is a cumulative effect, often dyed hair, the harmful ingredients contained in the hair dye will be gathered in the head skin or through the head skin, and into the blood circulation in the body to form a certain aggregation effect. In addition, a hair dye before pregnancy may lead to a one-time amplification of the cumulative harm, which may also have a certain impact on the fetus, which may lead to fetal growth retardation, deformed miscarriage, etc., and also have adverse effects on the mother, such as allergies, dermatitis, hair loss, etc.