Cockroach medicine is toxic and harmful to human body. Most of the chemical insecticides commonly used in life are aerosol, and it is very harmful: a. Most of the aerosol medicines are lingering, and the toxic substances first float in the air and then fall in every corner of the room, including food. When people enter the room, the harmful substances will invade the human body. Second, there are chemical insecticide fragrances, all contain toxic substances harmful to the human body, a long time of inhalation will paralyze the central nervous system of the brain, triggering diseases of the oral mucosa. As children and the elderly have poor resistance, so the morbidity is also high.