Most brushes do not wear out. They get killed, and almost always the same way: water in the ferrule.
Here is the method that keeps a set going for years, and the mistakes that end one in months.
How often should you wash makeup brushes?
Weekly for anything you use with liquids and creams: foundation, concealer, cream blush. Every two weeks for powder brushes. Eye brushes that touch cream shadow or gel liner go on the weekly schedule too.
If you are breaking out along the cheeks or jaw and cannot work out why, your foundation brush is the first suspect.
The method, step by step
- Wet the bristles only. Hold the brush with the head angled down under lukewarm water. Never let water run up toward the handle.
- Lather with a gentle cleanser. Swirl the head into your palm or a textured mat. Baby shampoo or a mild soap works; you do not need a dedicated brush cleaner.
- Rinse until the water runs clear. Keep the head angled down the whole time. With a foundation brush this takes longer than you expect.
- Squeeze gently and reshape. Press the excess water out with your fingers and pinch the head back into its original shape while it is still damp.
- Dry flat, over an edge. Lay the brush on a towel with the bristles hanging off the side of the counter so air reaches the head from every direction.
The mistake that ends brushes
Drying a brush upright in a cup. Water runs down the bristles, pools inside the ferrule where you cannot see it, and slowly dissolves the glue holding the head to the handle. Months later the head wobbles or comes off entirely and it looks like a manufacturing fault. It was the drying.
The other three worth avoiding: hot water, which loosens glue faster and can warp synthetic fibers; soaking the whole brush in a jar, same problem as the cup but quicker; and a hair dryer, which cooks the fibers out of shape.
Why synthetic brushes wash better
Natural hair has a cuticle, so pigment works into the shaft and stays there. You end up scrubbing, and scrubbing is what splays the head.
Synthetic fiber has no cuticle. Product sits on the surface and lifts off with one lather. That is also why synthetic brushes use less foundation in the first place: what you load onto the brush ends up on your face instead of buried in the bristle.
How long should a good set last?
Washed the right way, years. The bristles will soften slightly with age, which most people prefer. Replace a brush when the head stops holding its shape after reshaping, when it starts shedding consistently, or when the handle moves against the ferrule.
Consistent shedding from a new set is not a care problem. That is a build problem, and it is the reason we hand-check every set before it ships.