Because the moldy dried tofu is soaked in various harmful substances produced in the process of microbial metabolism, it is invisible to the naked eye. When the temperature reaches a certain level, various microorganisms, especially molds, multiply in large numbers, producing toxic substances. For example, there is a cold medicine that is harmful to the human body. If eaten, it will leave behind future troubles, causing symptoms of nerve, respiratory and urinary system damage, making people nervous paralysis, pulmonary edema, renal failure, and even cancer.