Dull hair: how can you restore shine?
Shiny hair is first and foremost hair with a smooth surface that reflects light. When radiance fades, the cuticle is often to blame. Here is how to protect it and revive your highlights.
By the Luxéol team · Reading time: 5 min · Updated on 9 July 2026
Key takeaways
- Shine depends on the cuticle: when its scales are smooth and tightly closed, they reflect light; when they lift, hair looks dull.
- Main culprits: hard water, heat, colouring, harsh brushing, product residue and dryness.
- Radiance is revived by sealing the cuticle: cool rinsing, smoothing treatments, heat protection.
- A nourished and well-hydrated hair fibre reflects light better than a dry fibre.
- When it comes to diet, normal and strong hair is also built from within (zinc, selenium).
Why does hair become dull?
Each hair is covered with a cuticle, a layer of overlapping scales. When they lie flat, light glides over them and hair shines. When they lift or become damaged, light scatters: hair looks dull.
The most common causes
- Hard water, which deposits minerals on the fibre and dulls highlights.
- Heat from hairdryers, straighteners and curling irons, which opens and weakens the cuticle.
- Colouring and bleaching, which sensitise the hair surface.
- Harsh brushing or friction (from a towel or rough pillowcase).
- Residue from styling products or overly rich shampoos.
- Dryness: hair lacking water and lipids reflects light poorly.
How can you restore shine to your hair?
The guiding principle: seal and smooth the cuticle.
- Finish with a cool-water rinse: the cold tightens the scales and instantly boosts highlights.
- Use a smoothing treatment (conditioner, mask) that coats the fibre.
- Use a shine treatment two to three times a week.
- Space out colouring sessions and choose colour-protecting treatments.
- Filter very hard water or occasionally use a clarifying rinse to remove deposits.
Everyday habits that protect radiance
- Lower the temperature of heated styling tools and apply a heat-protective spray before blow-drying.
- Detangle gently, from the ends to the roots, on towel-dried hair.
- Dry without rubbing: gently pat hair dry, ideally with a microfibre towel.
- Protect hair from the sun and chlorine, which also dull the fibre.
Nutrition: supporting normal hair
Shine is mainly about the surface, but a healthy fibre starts with well-nourished hair. Zinc and selenium contribute to the maintenance of normal hair, and selenium helps protect cells from oxidative stress. A varied diet remains the foundation.
The Luxéol shine routine
Luxéol shine treatment
A targeted step to smooth the fibre and revive highlights, to incorporate into your routine after shampooing. Pair it with gentle habits and heat protection for lasting radiance.
Shine is not just about products: it is the sum of small habits — temperature, gentleness, cool rinsing, protection — that makes all the difference week after week.
Frequently asked questions
Why have my hair suddenly become dull?
Does apple cider vinegar make hair shiny?
Can coloured hair stay shiny?
Does shine depend on diet?
Food supplements should be used as part of a healthy lifestyle and are not a substitute for a varied, balanced diet. This article is for informational purposes only and does not constitute medical advice. In the event of significant, sudden or persistent hair loss, consult a healthcare professional.
Sources
- European Register of authorised health claims (EC Regulation No 1924/2006) — zinc, selenium.
- Vidal.fr — “How to care for your hair.”
- French Society of Dermatology — guidance on hair structure and the cuticle.
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