Eyelashes naturally have bacteria on them. Your mascara wand is infected as soon as you use it! Bacteria thrives in the dark, moist environment of your mascara tube. Although many cosmetics contain preservatives that slow bacterial growth, over time bacteria will accumulate.
This can lead to bacterial infections like styes or pinkeye. You also risk fungal infections and general irritation. Most problems caused by makeup contamination are minor and temporary. However, these infections can progress into vision-threatening conditions.
Three or four months after opening, mascara should be discarded and replaced, no matter how much is left in the tube! And remember, most safety rules for mascara also apply to your liquid liner.
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Being makeup smart is important for your overall eye health. Let us know if you ever have any questions about your eye health and habits. Your healthy vision is important to us!
Top image by Flickr user mbtrama used under Creative Commons Attribution-Sharealike 4.0 license. Image cropped and modified from original.