Preparing for pregnancy is not yet pregnant as far as possible not to dye hair, so as not to prepare for the success of pregnancy to avoid affecting the health of themselves and the fetus. Hair dye is a kind of cosmetic product for coloring hair, which generally contains p-phenylenediamine and other coloring agents, which are internationally recognized as carcinogenic substances. Hair dye contact with the skin, hair coloring process heating, will make benzene organic substances through the scalp into the capillaries, with the blood circulation to reach the bone marrow, long-term hematopoietic stem cells can cause malignant changes, leading to leukemia. During a woman’s preparation for pregnancy, she may become pregnant at any time, and she should pay attention to avoiding contact with toxic and harmful substances. This includes prolonged and heavy exposure to chemicals in hair dyes, which in severe cases may cause malformations in fetal development or cause early miscarriage. In addition, do not contact with toxic and harmful substances, radiation, etc. during the preparation for pregnancy, do not take medication indiscriminately, need to quit smoking and alcohol, and consume more fresh vegetables with high vitamin content, such as tomatoes, broccoli, bamboo shoots, etc., to promote the development of follicles. You should also eat more soybeans and soybeans to supplement the estrogen that women need to promote ovulation and increase the chances of pregnancy. Pay attention to rest, do not overwork, avoid staying up late, keep a happy mood, and at the same time, should be supplemented with folic acid in advance 3 months before pregnancy to promote embryonic development and prevent fetal malformation.