There’s damage that you can see such as split ends, dullness and breakage. And then there is deeper damage, that is not as easily noticeable. Sean Sørensen, Senior Art Team member from Headmasters Soho, explains what is really happening inside your hair, and why bond repair is so crucial.
“At a molecular level, the very architecture of your hair is compromised by colour, heat, environmental stress and time. Enter bond repair. Less a treatment, more a structural reset.
Hydration helps, yes. But hydration without repair is like painting over cracked walls. Bond repair works deeper – it restores integrity where it’s been lost.”
So What is Bond Repair, Really?
At the core of each hair strand lie disulphide bonds – microscopic connectors responsible for strength and elasticity. When they break, hair weakens. Traditional treatments coat the surface of the hair, making it look and feel better temporarily. Bond repair does something fundamentally different: it reconnects what’s been undone, literally rebuilding the hair’s internal framework.
If you regularly colour, lighten or heat-style your hair, bond repair isn’t a luxury. It’s essential maintenance.
Sean’s Five Rules of Repair
Consistency over intensity
One miracle mask won’t undo months of damage. Regular use is where real, lasting change happens – build it into your routine rather than reaching for it in a crisis.
Hydration still matters
Bond repair restores strength. Moisture delivers softness. You need both – they work together, not in place of each other.
Watch the protein
Too much protein can tip the balance and leave hair feeling still or brittle. Alternate bond repair with nourishing, hydrating products to keep everything in check.
Trim with intention
Healthy ends matter. Bond repair is brilliant at what it does – but it isn’t a substitute for scissors. Keep up with your regular trims to remove damage and maintain the integrity of the hair.
Protect what you’ve rebuilt
Heat, friction and the minerals found in hard water can erode your progress. Defend your results with heat protection, gentle detangling and the right home care products.
What Sean Recommends – and Why
Kérastase Première
For bleached or brittle hair, this is the one. A decalcifying and bond-rebuilding innovation that removes calcium buildup – one of the most overlooked causes of brittleness – while restoring inner strength from a molecular level.
“Removes calcium build-up, an overlooked cause of brittleness, and restores inner strength. It’s high-tech haircare at its best.”
Use: Première Decalcifying Repairing Shampoo & Conditioner
Kérastase Bain Force Architecte
A classic for weakened, fragile hair in need of structure – lightweight enough for daily use but powerful enough to make a real difference over time.
“Lightweight but powerful. Perfect for daily damage control.”
Use: Bain Force Architecte Shampoo + Ciment Anti-Usure Conditioner
Kérastase Fusio Dose – In-Salon Treatment
The in-salon option for anyone who wants targeted, professional-grade repair in a single appointment. Custom-blended concentrates chosen specifically for your hair’s exact needs – no two treatments are the same.
“One treatment, instantly transformative. Tailored to your hair’s exact needs.”
Use: By prescription at your salon – ask your stylist at your next appointment. Find out more about the Fusio Dose here.
Pureology Strength Cure
Sulphate-free, vegan and colour-safe – this is the bond repair option for fine, colour-treated hair that wants serious results without any heaviness.
“It repairs without heaviness – ideal for fine, colour-treated hair.”
Use: Strength Cure Shampoo + NEW Dream Healer Serum
OLAPLEX No.3
The bond-builder that rewrote the rules of haircare. Science-backed, widely trusted and genuinely foundational in any serious repair routine – used once weekly at home for consistent, cumulative results.
“Science-backed and widely trusted. A foundational product in any serious routine.”
Use: Once weekly on damp hair before shampooing
Redken Acidic Bonding Concentrate (ABC)
High-strength, pH-balanced repair for compromised strands – brilliant used post-salon or post-summer when hair needs bringing back into balance.
“Balances pH while restoring integrity. Great post-salon or post-summer.”
Use: ABC Shampoo, Conditioner and Leave-In
The Bottom Line
“Healthy hair isn’t just soft – it’s structurally sound. If you’re not rebuilding bonds, you’re only treating half the problem. Minimal effort with maximum return. Bond repair is less about indulgence and more about intelligence.”
– Sean Sørensen, Art Team, Headmasters Soho
Ready to Start Building?
All of the products and treatments Sean recommends are available across Headmasters salons. Ask your stylist at your next appointment and they’ll help you build the right bond repair routine for your hair – whether that starts with an in-salon Fusio Dose or a take-home product prescription.
For full details on our in-salon treatment menu, visit our treatments page here. And to book your appointment at your nearest Headmasters salon, find your nearest salon here.
For more expert advice from our Art Team, follow us at @headmastersuk on Instagram.
