Tips from a Make-up Artist. Me!
Throw out your mascara after 2 to 3 months.
Powder eye shadows, face powder, bronzers and powder blushes should be thrown out every 9 to 12 months.
Cream shadows, blushes and highlighters should be trashed after 6 to 9 months.
Eye, lip, and brow pencils should be sharpened frequently.
Cosmetic brushes should be throughly washed every week.
Foundations tossed after 3 to 4 months, and lipsticks every 6 months.
Self-tanners and sunscreens/sunblocks are only good for one season. Thats means 3 to 6 months only, they go bad after that and may not work properly.
If anything starts to look or smell funny get rid of it.
After the given timelines it is likely that quite a bit of nasty bacteria is growing in your make-up, especially those eye products.
Do you really want to apply them to your face?
Never ever share eye and lip products!!