The Truth About Your Makeup Brushes (And Why Hygiene Isn't Optional)

If you've ever put off washing your makeup brushes for "just one more use," you're not alone! It is a topic we need to discuss!

A recent study published in the International Journal of Microbiology tested 57 cosmetic brushes and beauty blenders collected from everyday users and professional makeup artists, and the results are a wake-up call.

I am personally extremely fussy about hygiene as a makeup artist and am shocked by how slack people can become with the importance of sanitation.

In the study the majority of samples carried Gram-positive bacteria, including Staphylococcus and Micrococcus species, alongside Gram-negative bacteria like Pseudomonas. These aren't harmless dust particles sitting on your bristles — they're live microbial colonies that build up every time a brush touches skin, oils, and product residue without being properly cleaned.

Even more telling: when researchers surveyed the brush owners themselves, nearly half admitted to rarely cleaning their tools, and more than a quarter had already experienced skin problems they suspected were linked to dirty brushes. Awareness of good hygiene habits was strongly connected to how concerned people felt about bacterial infection — but simply knowing better didn't always translate into cleaning more often. That gap between knowledge and action is exactly where breakouts, irritation, and in rarer cases, more serious infections, take hold.

For anyone applying makeup — whether on your own face at home or on multiple clients a day — brush hygiene is not a "nice to have." It's a fundamental part of skin health.

Personal Use: Simple, but Non-Negotiable

For everyday use, the routine is straightforward:

• Wash brushes regularly with a gentle soap or detergent.

• Reshape the bristles and leave them to dry in the sun.

• Brushes my also be cleaned or sprayed with an additional alcohol solution for extra sanitation or if you are unable to wash your brushes

Sunlight helps naturally reduce bacterial growth while your brushes dry, and regular washing stops product, oil, and dead skin cells from accumulating in the fibres — exactly the environment the study identified as ideal for microbial growth.

Professional Use: A Higher Standard for Every Client

When brushes are used on multiple people, the stakes change. A brush that hasn't been properly sanitised doesn't just carry your own skin's bacteria — it can transfer bacteria, oils, and skin cells from one client directly to the next.

For professional makeup artists, brushes need to be thoroughly washed and sanitised after every single client, no exceptions.

Build a rotation of brush sets. Having several full sets of professional brushes on hand means you always have a clean, completely dry set ready to go — especially essential on jobs with back-to-back clients where there's no time to wash and fully dry brushes between appointments.

Avoid reusing brushes on a job wherever possible. It's simply not recommended. But if you drop a brush, or find yourself in a situation where you must reuse one:

• Drench the bristles in alcohol to thoroughly kill germs.

• Follow with a proper brush cleaner to lift any remaining makeup residue.

• A small stainless-steel dish makes an ideal, hygienic vessel for soaking brushes between uses.

End every day with a full wash and sanitise. Regardless of how brushes were used throughout the day, a thorough end-of-day clean resets your kit for the next job.

Why Brush Material Matters

Not all brushes are created equal when it comes to hygiene — and this is where synthetic, cruelty-free brushes have a clear advantage.

Animal-hair brushes have natural cuticles that absorb and hold onto moisture and bacteria, making them harder to clean thoroughly and more prone to trapping germs deep within the hair structure. Synthetic and vegan brushes, by contrast, don't have this cuticle structure. They're easier to clean and sanitise properly, and they don't hold onto moisture or bacteria the same way.

Beyond hygiene, synthetic brushes tend to be:

• Softer on the skin — an important consideration for sensitive or post-treatment skin.

• Better at blending product evenly across the face.

• Far less prone to shedding than natural hair bristles.

And importantly, synthetic brushes mean no animals are harvested or exploited in the making of your tools — making them the more compassionate choice as well as the more hygienic one.

The Bottom Line

Your makeup brushes touch your skin (or your client's skin) every single time you use them. Treat that contact with the same seriousness you'd give any other tool that comes into direct contact with skin. Wash personal brushes regularly and let them dry in the sun. Sanitise professional brushes after every client, keep multiple sets in rotation, and never let a day end without a full clean. Choose synthetic, cruelty-free brushes wherever you can — for your skin, your clients, and the animals who'd otherwise pay the price.

Good hygiene isn't glamorous, but it's the difference between a beauty routine that nourishes skin and one that quietly works against it.