The packaged bread sold in the market has a long shelf life, which can generally reach 3-6 months. This is mainly due to the addition of preservatives, so the storage time is longer.

Bread must be marked with a clear production date and shelf life, so it can be judged by the shelf life on its outer packaging.

Preservatives are food additives that can inhibit microbial activity and prevent food from spoilage. In order to make food have a certain shelf life, certain measures must be taken to prevent microbial infection and reproduction. Practice has proved that the use of preservatives is one of the most economical, effective and simple methods to achieve the above objectives.