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Hair Treatment

Hair treatments are the products most people skip and then wonder why their hair isn't getting better. Our hair treatments exist to change that, and they’re totally worth the step. These are the things that actually make your hair look good for more than a day.

The Bond Repair Balm reverses hair damage in 3 minutes.  The Treatment Masques (for Fine to Medium and Thick hair) deep-condition. The Scalp Serum balances and hydrates the scalp for the kind of fullness that shouts “healthy”. The Leave In Conditioner protects from heat damage up to 450°F every single wash.

All sulfate-free, paraben-free, phthalate-free, color-safe, and cruelty-free..

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Trio of The Ouai products including Detox Shampoo, Bond Repair Balm & Leave in Conditioner
 
OUAI Detox Shampoo, Bond Repair Balm, and Leave-In Conditioner displayed together.
+15% off
OUAI Hair Repair Kit containing three bottles: Medusa Shine Leave-In Conditioner, Detox Shampoo, and Bond Repair Hair Enhancer, displayed in front of their pink packaging box.
 
Two hands holding OUAI skincare bottles and a matching gift box, styled with white faux snow against a soft pink gradient background.
New Limited Edition
An amber OUAI shampoo bottle stands upright on a warm cream surface beneath a translucent cap. Text: “OUAI”, “DETOX SHAMPOO”, “SHAMPOOING DÉTOX”, “ALL HAIR TYPES”, “TOUS LES CHEVEUX”, “10 fl oz / 300 ml”.
Allure Best of Beauty Award 2026 logo on a red background
 
OUAI Detox Shampoo bottle being splashed with water, creating foam and bubbles.
Best seller
OUAI Leave In Conditioner trio in Melrose Place, St. Barts, and North Bondi scents.
 
OUAI Leave In Conditioner bottles in North Bondi, St. Barts, and Melrose Place scents.
+15% off Exclusive
Open the Hair Oil reviews section

Hair Oil

$32
Three identical frosted OUAI Scalp Serum bottles stand side by side on a cream surface, presenting a 90-day supply beneath white applicator caps.
 
A woman with long light brown hair applies a hair serum from a dropper bottle while holding another bottle. Large text reads 'CLINICALLY PROVEN TO IMPROVE THE LOOK OF FULLER, THICKER HAIR' and '100% OF USERS SHOWED IMPROVEMENT.
Exclusive LAST CHANCE
OUAI Leave In Conditioner North Bondi 6oz white bottle on beige background.
 
OUAI Leave In Conditioner North Bondi 177ml bottle resting on silver tray
New Look
OUAI Leave In Conditioner St. Barts 177ml bottle displayed on beige background.
 
OUAI Leave In Conditioner St. Barts bottle surrounded by tropical fruit drinks.
New Look

Hair treatments are the products most people skip and then wonder why their hair isn't getting better. Our hair treatments exist to change that, and they’re totally worth the step. These are the things that actually make your hair look good for more than a day.

The Bond Repair Balm reverses hair damage in 3 minutes.  The Treatment Masques (for Fine to Medium and Thick hair) deep-condition. The Scalp Serum balances and hydrates the scalp for the kind of fullness that shouts “healthy”. The Leave In Conditioner protects from heat damage up to 450°F every single wash.

All sulfate-free, paraben-free, phthalate-free, color-safe, and cruelty-free..

Hair Treatment Products FAQs

What are hair treatment products?

They’re products formulated to address specific hair and scalp concerns beyond what shampoo and conditioner alone can fix. Hair treatments target structural damage (Bond Repair Balm), deep dryness (Treatment Masques), scalp imbalance and thinning (Scalp Serum), and daily breakage and heat damage (Leave In Conditioner). They're the step in your routine that makes the most long-term difference. 

What's the difference between a hair treatment and a conditioner?

A conditioner is a daily step that smooths and softens hair after washing, primarily at the surface of the strand. A treatment goes deeper: it targets the hair's internal structure, repairs damage at a cellular level, or works on the scalp rather than the hair at all. OUAI Bond Repair Balm, for example, actively repairs broken bonds rather than just coating the outside of the strand with something that makes it feel smooth temporarily.

Who should use hair treatment products?

Anyone whose hair needs more than shampooing and conditioning can (and should) give it a go. If you use heat tools regularly, color your hair, have noticed dryness or breakage, or want to support fuller-looking hair over time, this is where real improvement happens. And hair treatments aren't exclusively for damaged hair, really, they're for anyone who wants their hair to actually get better, not just look temporarily OK.

How often should I use a hair treatment?

Depends on the product. Treatment Masques: once a week in place of your regular conditioner. Bond Repair Balm: on wash days in place of conditioner whenever you need it. Scalp Serum: daily, as a leave-in (this one requires real consistency because the results are cumulative over 90 days). Leave In Conditioner: after every wash.

Can hair treatments help repair damaged hair?

Yes. In fact, OUAI Bond Repair Balm is clinically tested to reverse hair damage in 3 minutes, repairing broken bonds within the fiber that cause brittleness and breakage. The Treatment Masques restore moisture and strengthen with keratin and panthenol. 

What types of hair treatments are available?

Our range covers different things. Bond Repair Balm for structural bond repair. Fine to Medium and Thick Hair Treatment Masques for deep weekly conditioning. The Scalp Serum for scalp health and the long-term appearance of thicker hair. The Leave In Conditioner for daily heat protection and frizz control. 

Should I use a hair treatment before or after conditioner?

Depends on the treatment. Bond Repair Balm and Treatment Masques are used instead of conditioner, not alongside it (apply after shampooing and rinse). The Scalp Serum is a daily leave-in; apply on wet or dry hair directly to the scalp and don't rinse. The Leave In Conditioner goes on after washing on damp hair. Read the specific direction for each product.

Can I combine multiple hair treatments in my routine?

Yes, especially since they're designed to work together. Scalp Serum daily. Bond Repair Balm or Treatment Masque on wash day. Leave In Conditioner after every wash.