Shampoo cleanses the scalp, conditioner closes the cuticle and makes detangling easier, the mask repairs the internal structure of the fibre. The first two are used at every wash, the third once or twice a week, in place of the conditioner. Confusing their roles is the most widespread mistake in haircare, and it leaves you with either weighed-down hair or hair that never really gets repaired.
The comparison in one table
| Shampoo | Conditioner | Mask | |
|---|---|---|---|
| Job | Cleanse | Close and detangle | Repair deep down |
| Where it acts | Scalp | Surface of the fibre (cuticle) | Inside the fibre (cortex) |
| Where to apply | Roots only | Mid-lengths and ends | Mid-lengths and ends, towel-dried hair |
| Processing time | 1 to 2 min of massage | 2 to 3 min | 5 to 10 min |
| Frequency | At every wash | At every wash | 1 to 2 times a week |
| Effect over time | Immediate | Until the next wash | Cumulative over several weeks |
Shampoo: cleansing, and nothing else
Shampoo rids the scalp of sebum, sweat, styling residue and pollution. Its formula rests on surfactants, molecules that capture oils and carry them away when you rinse.
All of its quality lies in the choice of those surfactants. Too harsh, and they strip the hydrolipidic film, irritate the scalp and dry out the lengths, which often triggers sebum overproduction in response. Gentle enough, and they cleanse without stripping. To learn how to recognise them on a label, read our guide to the INCI list.
One simple rule: shampoo is massaged into the scalp, not the lengths. And it never replaces the following steps, since cleansing slightly opens the scales of the cuticle. Something then has to close them again.
Conditioner: closing and detangling
That is precisely its job. After washing, wet hair is swollen with water, its scales are lifted, and it is at its most fragile: this is the moment when a single brush stroke tears and breaks it.
Conditioner deposits conditioning agents that smooth the cuticle and create a slippery surface. Detangling becomes easy, breakage drops, frizz decreases and shine returns, since a closed cuticle reflects light. Its processing time is short because it works on the surface.
The /RESTORE Conditioner adds a supply of keratin to that function, in a light texture designed not to flatten fine hair.
The mask: treating, not just softening
A mask is not a richer conditioner: what sets it apart is how deep it acts. Where conditioner works on the surface, a mask is formulated so that its actives cross the cuticle and reach the cortex, where they fill structural gaps and restore elasticity.
It is the treatment step of the routine: it repairs what conditioner merely makes look better. The /REPAIR Mask concentrates hydrolysed keratin, shea butter, wheat proteins and vitamin E. On mask day, it replaces the conditioner.
If your hair is showing signs of wear, breakage, split ends or a straw-like feel, this is the step to reinforce first: our guide to the 10 signs of damaged hair helps you judge how urgent it is.
The 5 mistakes that sabotage these three products
- Using the mask as a daily conditioner. Too rich, too often: the fibre saturates with protein and turns stiff and brittle.
- Applying conditioner to the roots. A guaranteed outcome: flat roots and faster greasing.
- Putting the mask on dripping wet hair. Saturated with water, the fibre absorbs almost nothing. Always squeeze it out first.
- Rinsing too quickly or with scalding water. Residue leaves hair dull, and heat reopens the scales the conditioner has just closed.
- Mixing ranges built on opposite logics. Pairing a very detergent base with a very rich mask means undoing on one side what you build on the other.
Coherent pairs exist for exactly this reason: the /RESET + /RESTORE Volume Duo for washing and detangling, the /REPAIR + /REVEAL Repair Duo for treatment and protection.
What about the fourth product?
A leave-in completes the trio without competing with it: it protects the fibre between washes, where the other three stop as you leave the shower. The /REVEAL Mist plays that role. How all four steps fit together, with the weekly schedule, is set out in our guide to the 4-step hair routine.
The three products: the essentials
- Shampoo goes on the scalp, conditioner and mask on the lengths.
- The mask replaces the conditioner, it is not added to it.
- 2 to 3 minutes for conditioner, 5 to 10 for a mask.
- Conditioner beautifies, a mask repairs: these are not the same effects.
- Hair does not get used to a shampoo: that is a myth.
Frequently asked questions about shampoo, conditioner and mask
Can you get by with shampoo alone?
On very short hair, possibly. At any other length, no: shampoo opens the scales as it cleanses, and without conditioner to close them again, hair tangles, breaks and dulls wash after wash.
Can a mask permanently replace conditioner?
No, except on very thick, very dry hair. Used at every wash, a rich mask saturates the fibre with actives and can make it stiff. Alternating gives the best results.
Is a mask applied before or after shampoo?
After. On clean, towel-dried hair, the actives penetrate a fibre free of its sebum. Pre-shampoo masks exist as a supplementary technique on very fine hair, but that is not standard practice.
Should you change shampoo regularly?
Hair does not build up a tolerance. If a shampoo seems less effective over time, it is usually residue build-up, often silicone-related, or a need that has changed with the season.
Do all three products have to be from the same brand?
It is not compulsory, but formulas from the same range share the same balance between protein and moisture and complement each other instead of cancelling each other out.
How long should each product be left on?
Conditioner, 2 to 3 minutes. Mask, 5 to 10 minutes. Beyond that, absorption plateaus, as our article on how long to leave a mask on explains.
Sources
- Draelos Z. D., "Essentials of Hair Care Often Neglected: Hair Cleansing", International Journal of Trichology, 2010.
- Gavazzoni Dias M. F. R., "Hair Cosmetics: An Overview", International Journal of Trichology, 2015.
Article written by the KERA NEXT editorial team. Individual results: the outcome may vary depending on the nature and condition of your hair.