Never share your mascara, do not apply store makeup testers directly, and replace your tube every 3 to 6 months to avoid the transmission of eyelash mites and bacteria.

noli's read

The creator's warning is particularly solid and supported by rigorous research in skin and eye hygiene. First, an experimental study published in the scientific journal *PMC* (2021) demonstrated that the eyelash mite (*Demodex*) can survive for approximately 21 hours in mascara, confirming that sharing makeup easily transmits these small organisms. Furthermore, a randomized clinical trial (2008) revealed that more than 36% of mascara tubes contained bacteria or fungi after only 3 months of daily use, fully validating the recommendation for rapid replacement. Indeed, the darkness and humidity of the tube constitute an ideal culture medium once the product's preservatives begin to break down. Finally, the American regulatory agency *FDA* (expert opinion) confirms that public testers are highly exposed to germs and strongly advises against their direct application to preserve the protective barrier of your eyes. This advice is therefore scientifically indisputable and constitutes an excellent habit for a healthy beauty routine.

the sources

No named source held this one up — that absence is part of the verdict.