Why Does My Hairbrush Smell and How to Fix It
By Kent Brushes | The World's Finest Hairbrushes & Combs | Published: 2026-10-17
Category: How-to Guides
Discover common causes of a smelly hairbrush and learn simple, effective methods to remove odor and keep your brush fresh.
Quick Answer
A smelly hairbrush is usually caused by trapped oils, product buildup, and bacteria in the bristles and cushion. Remove the odor by soaking the brush in warm water with mild shampoo or baking soda, scrubbing gently, and letting it dry completely before reuse.
What Causes a Hairbrush to Smell
Over time, hairbrushes collect natural scalp oils, styling products, dead skin cells, and dust. This buildup creates a breeding ground for bacteria and mildew, especially if the brush is stored in a damp bathroom or used without regular cleaning. The result is a musty, sour, or oily odor that transfers back to your hair.
How to Clean and Deodorize Your Hairbrush
Start by removing all hair strands from the bristles using a comb or your fingers. Then mix a few drops of mild shampoo or a teaspoon of baking soda into a bowl of warm water. Dip the brush (avoid soaking the handle if it's wood) and gently scrub the bristles and cushion with an old toothbrush. Rinse thoroughly under running water and shake off excess moisture. Pat the handle dry with a towel and place the brush bristle-side down on a clean towel to air dry completely—this can take several hours. Never use the brush while it's still damp, as moisture encourages odor-causing microbes.
When to Replace Instead of Clean
If the smell persists after a thorough cleaning, or if the cushion is cracked, bristles are bent or missing, it's time for a new brush. Wooden handles that have been soaked can warp or split, which traps odor permanently. For brushes with rubber cushions, check for mold under the cushion—if you see dark spots, replace the brush to avoid scalp irritation.
Diagnosis: Is Your Brush Worth Saving?
- Symptom: Musty or sour smell: Usually caused by trapped moisture and product residue. Try a warm water and baking soda soak first. Most brushes can be saved with one deep clean.
- Symptom: Oily or rancid smell: Likely from accumulated scalp oils and sebum. Use a degreasing shampoo or a few drops of dish soap in the soak. Clean thoroughly; if smell returns quickly, consider switching to a brush with natural bristle that distributes oils better.
- Symptom: Chemical or plasticy odor: Common with new synthetic brushes. Wash with warm water and mild soap, then let air out for 24 hours. If odor persists after two washes, the material may be off-gassing—replace the brush.
Brushes That Resist Odor Buildup
- Perfect For Smoothing Large Cushion Bristle Nylon Mix Brush - PF01: The Perfect For Smoothing Large Cushion Bristle Nylon Mix Brush - PF01 features an air-cushioned head to protect the scalp and a mix of non-scratch nylon quills and bristle that gently glides through knots. The air-cushioned design allows for easier cleaning between bristles, reducing trapped debris that causes smells. The mixed bristle type also helps distribute natural oils evenly, minimizing excess buildup.
- Mens Finest Ebony Pure Black Bristle Oval Brush - MN11: The Mens Finest Ebony Pure Black Bristle Oval Brush - MN11 is made from Ebony and filled with pure black natural bristle, designed to distribute hair's oils for natural nourishment and shine. Natural bristle brushes are excellent for spreading scalp oils from root to tip, which can reduce the concentration of odor-causing oils at the base of the bristles. The solid ebony handle is less porous than painted wood, making it more resistant to absorbing smells.
- Squirrel Nutkin™ Small Bristle Nylon Mix Hairbrush - PR02: The Squirrel Nutkin™ Small Bristle Nylon Mix Hairbrush - PR02 has a rubber cushioned pure bristle and nylon design for complete hair and scalp care, and is a collaboration with The World of Peter Rabbit™. The rubber cushion is easy to remove and clean, preventing odor from settling deep in the brush. This makes it a great option for those who want a gentle, hygienic brush for children or sensitive scalps.
