The reuse of linens in contact with food is strictly regulated to prevent the spread of pathogens. According to the ServSafe Manager curriculum and the FDA Food Code, cloth napkins or linens used to line bread baskets or other food containers must be replacedeach time the container is refilled for a new consumer. This is because the linen has been exposed to the environment and potential contamination from the previous guest, including saliva, touch, or airborne droplets.

Linens are considered "single-use" in the sense that they must be laundered after one service sitting. If a container is refilled for thesamecustomer during their meal (Option B), the napkin does not necessarily need to be changed, though it is good practice. However, once that guest leaves, the napkin and any leftover food must be removed. The napkin must then be laundered according to commercial standards (using high heat and chemicals) before it can be used again. Waiting until the end of a shift (Option D) or the beginning of a new one (Option A) would allow for the accumulation of bacteria and significant cross-contamination between different groups of diners. This rule is a subset of the "No Re-service" policy, ensuring that every guest receives a clean, sanitary dining experience free from the biological hazards of previous occupants.