Hair coloring is not allowed in late pregnancy. As hair dyes contain a variety of chemical substances, it is easy to enter the body through the hair roots, which will cause certain effects on the fetus and pregnant women, and the main ingredient of hair dyes is benzene diamine plus hydrogen peroxide formulated. It also contains a large amount of lead compounds, which can cause allergies in pregnant women. Toxic substances may enter the body of the fetus through the placenta along with the blood, which can cause some damage to the DNA in the cells of the pregnant woman, which can lead to mutations in the cells. It is recommended to stay away from toxic and harmful gases or objects during pregnancy, do not take drugs indiscriminately, pay attention to rest, avoid staying up late, appropriate exercise to enhance resistance, if there is discomfort, need to go to the hospital in time.