Damaged hair is not one condition but a spectrum, and Kérastase built Résistance to read it precisely. The range works to a proprietary erosion scale — from level 1, hair only beginning to weaken, to level 4, hair severely over-processed — and its three sub-lines each answer a different kind of damage along it. Choose by where your hair sits on that scale rather than by guesswork, and the right sub-line becomes obvious. Here is how to place your hair, and which Résistance meets it.
What Is the Kérastase Résistance Range?
Résistance is Kérastase's reconstruction line — formulated for hair that is structurally weakened, not merely dry (that is Nutritive), faded (Chroma Absolu), or falling (Genesis). What sets it apart is the erosion scale it is organized around: a four-point measure of damage from professional services and heat. Force Architecte is dedicated to standard damaged hair (erosion levels 1–2), while Thérapiste is engineered specifically for severely damaged and over-processed hair (erosion levels 3–4) The third sub-line, Extentioniste, sits slightly outside that scale — it addresses a pattern rather than a severity, which we will come to.
All three share one philosophy — reconstruct the hair fiber from within — but they differ in potency and in the hair they are built for. Placing yourself correctly on the scale is the whole task; everything after follows from it. Browse the full Kérastase Résistance collection as you read.
Erosion Levels 1–2 — Kérastase Résistance Force Architecte
Force Architecte is for the early-to-moderate end of the scale: hair that has been colored, lightly bleached, or heat-styled regularly, and that breaks now and then without yet feeling brittle all over. In a Filipino context, this is the rebond client a few months past her service, noticing the regrowth begin to weaken where it bends; the daily flat-iron user who skips heat protection; the first-time color client whose hair is just starting to show it. If your hair snaps when you brush but isn't yet brittle from end to end, this is the Force Architecte window.
The ritual is a sequence rather than a single product: the Force Architecte Shampoo, the Ciment Anti-Usure Conditioner, a weekly Force Architecte Mask, and — the step most people in our climate should not skip — the Ciment Thermique Blow Dry Primer, a leave-in that protects against heat while it reconstructs. For anyone blow-drying daily, that dual action does two jobs in one step. The complete sub-line, ritual sets included, lives in the Force Architecte collection.
A note on precision: Force Architecte is not "for all damaged hair." It is built for a specific potency range, and its mask is distinct from the Thérapiste mask further up the scale — they are not interchangeable. If you have been on Force Architecte for four to six weeks and your hair still breaks significantly, that is the signal your erosion level is higher, and Thérapiste is the escalation.
Erosion Levels 3–4 — Kérastase Résistance Thérapiste
Thérapiste is the higher-potency intervention, for hair at the severe end of the scale: bleached more than once, multi-processed in close succession — color over rebond over a perm — or visibly brittle, breaking in pieces, with the dry, straw-like texture that marks erosion 3–4. The balayage and ombré client maintaining a rebond, the salon-hopper whose services have conflicted, the reader whose hair snaps in sections when combed — this is the sub-line built for them.
The ritual steps up accordingly: the Thérapiste Shampoo, a more intensive Thérapiste Mask, and the leave-on Thérapiste Sérum, applied before drying. It is important to read these as a step up in intensity, not a parallel option — Thérapiste is where you go when Force Architecte is no longer enough. The full sub-line is gathered in the Thérapiste collection.
The honest framing matters here. Severely processed hair is reconstructed and strengthened, not returned to virgin condition — bleach cannot be fully reversed, only significantly fortified, and any product promising otherwise is overstating. Real use bears this out: one HairMNL buyer, Celine A, left only two stars in July 2025 — but solely because the pump arrived broken. Of the formula itself she wrote, "The product is great though… I used it when scuba diving or in the beach and my hair is less dried out." Even a manufacturing mishap couldn't dent her verdict on the formula. Browse the full damaged hair collection for more options at this end of the scale.
For Length Retention — Kérastase Résistance Extentioniste
Extentioniste is the sub-line most often misunderstood, because it does not sit on the same axis as the other two. It is not a milder Thérapiste; it answers a different problem entirely — hair weakened at the lengths, with split ends and breakage along the mid-shaft and tips that make growing long a losing battle. Your roots can be perfectly healthy and your erosion level low, and Extentioniste can still be exactly right, because the damage you have is concentrated where it works: from mid-shaft to end.
It is, in Kérastase's own framing, formulated to reinforce the length of damaged hair and address split ends — which makes it the natural choice for anyone growing out previously rebonded hair (the treated section often more eroded than the fresh regrowth), or anyone trying to keep length past the shoulders while humidity and daily combing snap the ends. The hero of the line is the Extentioniste Sérum, a leave-on that targets split ends directly; pair it with the Extentioniste Conditioner, or start from the full lineup — shampoo, mask, and the Long Hair Training ritual sets — in the Extentioniste collection.
Two clarifications, because they are the usual errors: Extentioniste is about length retention, not hair growth — it helps you keep what you grow, it does not stimulate new growth. And it is not the "beginner" Résistance; it simply serves a different pattern of damage.
How to Choose: The Quick Résistance Decision Framework
| Your hair's condition | The right Résistance |
|---|---|
| Occasional heat damage, slight weakness at the roots (erosion 1–2) | Force Architecte |
| Bleached or multi-processed, visible breakage, dry straw texture (erosion 3–4) | Thérapiste |
| Split ends, breakage at the mid-lengths and tips, trying to retain length | Extentioniste |
| Healthy scalp, damaged ends only | Sérum Extentioniste as a standalone add-on |
Most people underestimate where they sit, so anchor your level to what you actually do to your hair. If you color or flat-iron regularly but have never bleached, you are likely at erosion 1–2 — Force Architecte territory. If you maintain a rebond and color, or you have bleached for balayage or ombré, that combination tends to push you toward 3–4, where Thérapiste belongs. And the climate is an accelerant in its own right: chemical processing, plus daily heat styling, plus the sweat and humidity of the city erode hair faster than a temperate climate would — which is why, for anyone who treats their hair here, Résistance reads less as a luxury than as ordinary maintenance.
You can also combine: the wash-and-care steps address overall damage by level, while the leave-on serums target specific zones — so a Thérapiste shampoo with an Extentioniste serum is a legitimate pairing. A practical note for anyone who rebonds every three to four months: you likely sit at erosion 2 between services and erosion 3 in the weeks just after one — which means Force Architecte as maintenance, and Thérapiste for the fragile fortnight post-rebond. Explore protein treatments if your hair needs structural support between Résistance steps.
Building Your Résistance Ritual Step by Step
Reconstruction is a sequence. Cleanse with your level-matched shampoo; follow with your sub-line's conditioner where it has one — the Ciment Anti-Usure for Force Architecte, the Extentioniste Conditioner for lengths (Thérapiste goes straight to treatment); and once a week leave the mask on for three to five minutes — long enough for the reconstruction to take. Finish with the leave-on serum, or, if you heat-style, the Ciment Thermique primer, which protects and strengthens in the same step.
Frequency is a fair question in our climate, where many wash daily. The Résistance shampoos and conditioners are formulated for frequent use, daily included; only the mask is a weekly treatment rather than an every-wash step. Mixing sub-lines within the ritual is fine — a Thérapiste shampoo with an Extentioniste conditioner is a valid combination when your damage is both severe and length-concentrated.
Set your expectations honestly: visible improvement from reconstruction is a matter of weeks of consistent use, not a single wash. As one long-term Kérastase user, Toni Salinas, put it of the brand's results, "Use it continuously and you'll see a difference" — a sentiment that holds across the line. For the complete range, see all Kérastase at HairMNL.
Damage has a scale, and Résistance is built to it. Place your hair honestly — early weakening, severe over-processing, or breakage at the lengths — and the sub-line that answers it is already clear. Match it, commit to the ritual for a few weeks, and reconstruction does the rest. Buy authentic, stay consistent through the full course, and the hair you rebuild is hair that stays rebuilt.
