It is better not to dye your hair during the preparation period, because you may get pregnant at any time during the preparation period. Once you dye your hair, and the toxic and harmful substances in the hair dye, such as dioxins, may enter the blood circulation through the skin, and dioxins themselves can cause cancer, it is better not to dye your hair during the preparation period. Once you are pregnant, your body’s resistance decreases, and hair dyes can have a corresponding effect on the fetus or have an adverse effect on the pregnant woman. It is recommended that you do not dye your hair during the period from the beginning of pregnancy preparation until after pregnancy to breastfeeding, as this may have a related effect on the pregnant woman and the fetus.