Bacteria (like the kind that causes pinkeye and other infections) can start to grow in an open mascara tube within three months of use. Plus, with lots of pumping, the product will begin to dry out around the same time. Some products even have a hidden expiration date.
4. Fire extinguishers
Most fire extinguishers don’t expire for five to 15 years, depending on the type, but things like cracks in the hose and the pressure can affect how well they work.