Sadly, all beauty products expire. But fellow makeup lovers, there’s nothing to get sentimental about because using them beyond their expiration date, obviously, won't do you any good. Not only are they less effective past its due date, but they can also put your health at risk by causing eye infections, skin irritations, rashes, blemishes, etc. Don’t want any of that? Then listen carefully. 

Before opening a new product, make sure to take a look at “best by” date or the Period-After-Opening (PAO) symbol, showing an open jar followed with a letter M indicating a monthly lifespan of a beauty product once it has been opened for the first time. Personally, I find it best to record the date of opening (with a permanent marker) right on the back of the package or keep a journal of expiration dates, instead. This will make the process of tracking the expiration dates a whole lot easier. 
Also, you should consider a few important factors when deciding whether to toss out or keep your beloved makeup products:
  • the product has expired or is well-past its prime
  • has changed in smell and appearance
  • has caused an allergic reaction
  • what type of product it is (life span) 
Here's a quick guide on the life span of common makeup products: 
How to maximize your makeup’s shelf life:
  • Make sure you close the lid firmly after each use
  • Keep in a cool, dry place, away from direct sunlight, heat, and humidity
  • Don’t share your makeup with others
  • Wash your hands before applying makeup
  • Keep your makeup products clean and tidy
  • Keep track of expiration dates, always