Dull, Frizzy Hair: Causes, Signs & How to Address It

Dull, Frizzy Hair : Causes, Signs & How to Address It

Hair that looks dull, feels rough to the touch or seems to frizz the moment humidity hits, these are some of the most common hair concerns, affecting all hair types and textures. The causes are multiple: an open cuticle, dehydration, environmental aggressors or mechanical damage from everyday styling habits. The result is hair that loses its natural light-reflecting ability and feels harder to manage. The Kérastase Gloss Absolu range was developed to help address these visible signs, with two tailored formulas designed for different hair textures, both powered by the same science-backed "Power Trio" of actives.

What causes dull, frizzy hair?

Dullness and frizz rarely have a single cause. Most often, they are the result of a combination of factors that affect the hair cuticle, the outermost protective layer of each hair strand.


  • Internal factors:
    • Dehydration: When hair lacks moisture, it loses its elasticity and light-reflecting ability.
    • Porosity: High porous hair absorbs and loses moisture more rapidly, making it prone to frizz.
  • External factors:
    • Humidity: Moisture in the air penetrates the open cuticle, causing the fiber to swell and frizz.
    • Hard water: Mineral deposits from tap water create a dull, coating layer on the hair surface.
    • Heat styling: Frequent use of hot tools without protection can lift and damage the cuticle.
    • Environmental pollution: Oxidative stress from urban environments contributes to dullness over time.
    • Chemical treatments: Coloring, bleaching, or relaxing can increase porosity and reduce shine.

WARNING SIGNS TO LOOK OUR FOR

Signs that may indicate dullness and frizz concerns:

-Hair that looks flat, lifeless or lacks shine even after washing
-Rough, coarse texture when running fingers through the hair
-Visible flyaways or unruly strands, especially in humid conditions
-Hair that tangles easily or feels difficult to manage
-Ends that appear dry, split or frayed
-Color that looks faded or lacks vibrancy

These signs are common and can be addressed with the right haircare ritual.

The Open Cuticle: The Root of the Problem

At the heart of both dullness and frizz is one key structural issue: an open or lifted cuticle. When the cuticle, the overlapping scale-like layer that protects each hair strand — is smooth and flat, it reflects light evenly, giving hair its natural shine. When it is raised or damaged, light scatters rather than reflects, creating a dull appearance. Humidity then enters through the open cuticle, causing the fiber to swell unevenly, the primary mechanism behind frizz. Addressing the cuticle is therefore the first step toward glossier, smoother-looking hair.

The Power Trio - 3 Actives, One Goal: Gloss


Hyaluronic Acid, renowned for its moisture-retaining properties in skincare, now works its magic on your hair, ensuring deep hydration.
Glycolic Acid, a gentle yet effective exfoliant, refines the hair fiber for enhanced smoothness and shine.
Wild Rose in oil, sourced responsibly from France, not only imparts a captivating fragrance but also nourishes and protects your hair.

How to Use the Gloss Absolu Ritual

Choose your formula first:

Fine, medium or normal hair type → Regular  (Bain Hydra-Glaze + Insta-Glaze)
Thick, dry or very frizzy ahir type → Crème (Bain Crème + Masque Crème)

Frequently Asked Questions

What is the difference between the Regular and Crème formulas?
Both the Regular and Crème formulas share the same Power Trio of actives; Glycolic Acid, Hyaluronic Acid and Wild Rose Oil and target the same concerns: dullness and frizz. The key difference lies in texture and intensity. The Regular formula (Bain Hydra-Glaze) is a lightweight gel-lather suited to fine or medium hair, providing shine without weight. The Crème formula (Bain Crème Hydra-Glaze) offers a richer, more nourishing lather designed for thick, dry or very frizzy hair that needs deeper hydration and more intensive frizz control.

Can I use Gloss Absolu on color-treated hair?

Yes, the Gloss Absolu range is suitable for color-treated hair. The Glycolic Acid in the formula helps remove mineral deposits that can cause color to appear dull, while the Hyaluronic Acid helps maintain hydration levels that color-treated hair often lacks. For hair that is both color-treated and in need of intensive repair, we recommend consulting your hair professional to find the most suitable ritual for your specific needs.

How long before I see results with the Gloss Absolu range?
Many users notice an immediate improvement in shine and smoothness after the first use. For longer-lasting frizz control and sustained hydration, consistent use as part of your regular haircare ritual is recommended. If you have persistent concerns about your hair's condition, such as significant breakage, scalp discomfort or extreme dryness, we recommend consulting a hair care professional for a personalized assessment.

Gloss Absolu Routine

At Kérastase, we believe in the power of a complete haircare routine. Discover the products of this range and maximize your results!

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EXPERT PERSPECTIVE

“

The use of Glycolic Acid in haircare is a significant evolution—borrowed directly from skincare science. By gently smoothing the cuticle surface and removing mineral buildup, it allows the hair to reflect light more evenly, which is the fundamental mechanism behind visible shine. Combined with Hyaluronic Acid for hydration, this is a genuinely science-backed approach to addressing dullness.

”

— Dr. Francesca Fusco, Dermatologist & Hair specialist

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