Yes, pepper spray can expire. Like other self-defense products, pepper spray has a limited shelf life, and it can lose its potency over time. The exact expiration date of pepper spray will depend on the specific formula and manufacturer, but POM pepper spray will have its expiraiton date printed on the bottom of the canister. It is important to check the expiration date of your pepper spray and replace it if it has expired. Expired pepper spray may not be as effective as fresh spray, and it could potentially cause more harm than good if it is used in an emergency situation.