The main purpose of using public spoons and chopsticks is to reduce the chance of indirect oral-oral contact and the risk of indirect oral-oral transmission, to prevent and minimize the spread of cross-infection and food-borne diseases, and to cut off the transmission of infectious diseases from mouth to mouth. If you don't use a common spoon and chopsticks, you can transfer bacteria from your own mouth and nose to the dishes through the chopsticks, and it can also lead to cross-contamination of bacteria carried by different dishes themselves.

The use of public spoons and chopsticks has two benefits: 1) cleanliness and hygiene, prevention of disease; 2) reduce waste, civilized dining.