When you reach for the milk in your fridge, the first thing you do is the sniff test followed by the expiry date check.
If it's exceeded it's expiry date, will you continue drink it? I doubt it.
So why would you apply expired makeup to your face?
Some people don't even know how or where to check for expiry dates on their cosmetic products.
All cosmetics are made under strict conditions to control the growth and accumulation of microbes during use.