Health supervision of the people concerned said that the use of boiling water before meals, only to obtain psychological comfort, it is difficult to achieve the role of disinfection. For tableware, high-temperature boiling is indeed the most common way of disinfection, a lot of germs can be sterilized by high-temperature way to kill. However, high temperature sterilization to achieve the effect must have two conditions: one is the temperature of the action, the other is the time of action. Hot dishes with boiling water, because the action time is too short, can only kill a very small number of microorganisms, can not kill all pathogenic bacteria. There are many kinds of microorganism that cause intestinal spread disease, such as pathogenic Escherichia coli, Salmonella, Vibrio cholerae and so on. These bacteria typically undergo 100 ℃ for 1-3 minutes or 80 degrees of heat for 10 minutes to die. Some bacteria have strong resistance to high fever, such as Bacillus cereus, and instant heat has no effect on them at all.