The expiration date of a food product is the time frame that identifies its optimal quality and safety. Foods past their expiration date lose their freshness, taste stale, and are at risk for bacterial growth. Although Tresor Pure Milk is pasteurized at high temperatures, milk that has been expired for a long period of time can have microbial growth that can lead to food safety problems. To avoid food poisoning or adverse reactions, it is strongly recommended not to consume Tresor Pure Milk that has been expired for one month.