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, the hair looks dull.
- Main culprits: hard water, heat, colouring, aggressive brushing, product residue and dryness.
- Radiance is revived by sealing the cuticle: a cool rinse, smoothing treatments and heat protection.
- A nourished and well-hydrated hair fibre reflects light better than a dry fibre.
- From a dietary perspective, normal, 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 the hair shines. When they lift or become damaged, light scatters: the 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.
- Rough brushing or friction (from a towel or a 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: cold tightens the scales and instantly boosts highlights.
- Use a smoothing treatment (conditioner or mask) that coats the fibre.
- Use a shine treatment two to three times a week.
- Space out colouring treatments and choose colour-protecting care.
- Filter very hard water or use an occasional clarifying rinse to remove deposits.
Everyday habits that protect radiance
- Lower the temperature of heated styling tools and apply a heat-protectant spray before blow-drying.
- Detangle gently, from the ends towards the roots, on towel-dried hair.
- Dry without rubbing: pat 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 against 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 and protection — that makes the difference week after week.
Frequently asked questions
Why has 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 information 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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