Hair dyes usually contain toxic and harmful chemical components, so women are often advised to get pregnant more than 3 months after dyeing their hair. The toxic ingredients in hair dye can cause contact dermatitis, asthma and other diseases, and are absorbed through the skin and then enter the bloodstream, where they are broken down and detoxified by the liver. The life span of a cell is about 3 months, so if you want to get pregnant after dyeing or perming your hair, it is recommended that you wait at least 3 months before getting pregnant, when the toxins are basically metabolized and the poisoned cells are discharged from the body after metabolism, which will not affect the quality of the follicles. In addition, during the preparation period, it is recommended that both spouses do a moderate amount of aerobic exercise every day to improve the quality of sperm and eggs; quit smoking and drinking, try to avoid spicy and stimulating food or food containing more additives; stay away from toxic and harmful gas environment, pets, radiation, etc., and do a comprehensive prenatal examination.