After several swims in the pool, hair can sometimes become drier, rougher, or more difficult to style. Some people also notice duller lengths, brittle ends, or less defined curls.
Chlorine is often responsible for these changes.
Used to disinfect pool water, chlorine helps eliminate bacteria and maintain clean water. However, repeated contact with hair can gradually weaken the hair fiber and increase dehydration of the lengths.
Colored, curly, or sensitized hair is generally the most affected.
In this article, discover the effects of chlorine on hair, why certain hair types are more vulnerable, and how to effectively protect your lengths before and after swimming.
Why does chlorine damage hair?
Chlorine has powerful cleansing and disinfecting properties.
When it comes into contact with hair, it can remove part of the natural lipid film that protects the hair fiber.
Result: hair gradually becomes drier and more fragile.
The effects of chlorine on the hair fiber
Repeated exposure to chlorine can cause:
- drier hair
- rough lengths
- a loss of shine
- brittle ends
- increased frizz
- more porous hair
- less defined curls
- difficult-to-detangle hair
Chlorine particularly weakens lengths already sensitized by:
- coloring
- bleaching
- heating tools
- sun exposure
- overly aggressive routines
In summer, the damage is often amplified by the combination of chlorine + sun + heat.
Why does hair become dry after swimming?
After several swims, hair gradually loses its natural hydration.
Chlorine removes the natural protective film
Hair is naturally protected by a thin lipid layer produced by the scalp.
Chlorine can alter this natural protection and make the fiber more vulnerable to dehydration.
Result:
- hair becomes rougher
- lengths lose suppleness
- ends break more easily
Textured hair is often the most sensitive because it is naturally drier.
Repeated swimming exacerbates damage
During the summer, hair is often exposed to chlorine several times a week.
The aggressions then become cumulative.
Lengths can gradually:
- lose their softness
- become dull
- tangle more
- lack suppleness
To learn more, also discover our article: Sun, sea, pool: how to protect your hair?
Can chlorine change hair color?
Yes, chlorine can alter the appearance of colored or bleached hair.
Why is colored hair more sensitive?
Colored hair already has a weakened fiber.
Chlorine can then:
- accelerate fading
- dull the color
- alter certain reflections
- make lengths more porous
Blonde or very light hair is often the most affected.
Some people even notice the appearance of greenish reflections after repeated swimming.
Why does hair turn green in some pools?
Contrary to popular belief, it is not directly chlorine that colors hair green.
This phenomenon generally comes from certain metals present in the water, such as copper, which deposit more easily on light hair weakened by chlorine.
To delve deeper into this topic, also discover: Colored hair and sun: what to do?
Do all hair types react the same way to chlorine?
No.
Some hair types resist chlorine relatively well while others quickly become very dry.
The hair most sensitive to chlorine
Chlorine particularly weakens:
- curly hair
- frizzy hair
- kinky hair
- colored hair
- bleached hair
- porous hair
- already dry hair
Textured hair naturally has less protection on the lengths because sebum is more difficult to distribute to the ends.
They therefore require more hydration during the summer.
How to protect your hair from chlorine?
Fortunately, a few simple steps can significantly limit pool-related damage.
1. Wet your hair before swimming
This gesture is one of the most effective methods.
Hair acts like a sponge. When dry, it absorbs more chlorinated water.
Hair that is already wet absorbs less chlorine.
Before swimming:
- rinse your hair with clear water
- thoroughly dampen the lengths
- apply a light protective treatment if necessary
This habit helps limit hair dehydration.
2. Apply a protective treatment before swimming
Oils and leave-in treatments help create a protective barrier around the hair fiber.
Shaeri Hair Oil, for example, helps to:
- protect the lengths
- nourish the ends
- limit dehydration
- preserve hair suppleness
- reduce frizz
Its light texture allows for daily use during the summer.
3. Tie your hair up while swimming
Protective hairstyles help limit:
- friction
- knots
- breakage
- excessive exposure of the ends
In summer, favor:
- loose braids
- low buns
- twists
- loose ponytails
4. Rinse hair immediately after swimming
Rinsing is essential after every swim.
Even without shampoo, it helps to:
- eliminate chlorine residue
- limit dryness
- reduce frizz
- prevent rough hair
The longer hair remains exposed to chlorine, the greater the damage.
Frequently Asked Questions
Can chlorine cause hair loss?
No, chlorine does not directly cause hair loss, but it can weaken the hair fiber and increase breakage.
Why does my hair become rough after swimming?
Chlorine removes part of the hair's natural protection and increases dehydration of the lengths.
Does a swimming cap fully protect hair?
No, but it significantly limits contact with chlorinated water.
