If you're like me, you probably don't go through your makeup drawer as often as you should.

The truth is, though, that makeup does not last forever, and if you haven't worn that now foul-smelling orangey-red lipstick you bought two years ago, it's probably a good idea to toss it.

The question is, how old is too old when it comes to makeup?

Click through to find out the expiration dates on most of your favorite makeup and skincare products.

• Perfume: 2 years.

A perfume's scent changes more quickly if you use it often because every time you spritz, a little bit of air goes into the bottle. Perfumers suggest you use a perfume within two years of purchase if you want it to smell like it did when you bought it. After that, it's not harmful, but it probably will smell a bit different due to its age.

• Concealer: 1 year.

• Makeup brushes: Wash every 2-3 months.

• Face cream: 6-12 months.

If your face cream is in a jar, toss it after 6-9 months (your fingers can carry bacteria). If it's in a pump, it's good for up to a year. Alpha hydroxy creams need to be tightly sealed or they may become more concentrated over time.

• Eyeliner (pencil): 3 years. Sharpen regularly.
  

• Mascara: 3 months.

Mascara has a short shelf life once you've started using it because it's an easy place for bacteria to grow. Ew. The moral of this story: Use it up fast and then throw it out!

• Eyeshadow: Up to 3 years.
  

• Sunscreen: 1 year.

Sunscreen is generally good for about a year after you've opened the bottle.

• Lipstick: 2-4 years.

If it smells/tastes funny on your lips, throw it out.

• Foundation: Water-based, up to 12 months. Oil-based, up to 18 months.

• Nail polish: 1 year.

Nail polish begins to separate after a year or so and won't go on as smoothly on your nails.

• Lip liner (pencil): Up to 3 years.

Any questions?

Image via kerotab/Flickr