Most smoothing treatments coat the surface and call it a day — then the frizz strolls back in the moment they wash out. This one goes deeper, reprogramming your hair from the inside so sleek becomes its default setting rather than a once-off favour.
TL;DR: A progressive, heat-activated smoothing treatment from L'Oréal Professionnel, powered by Keratin-Alpha Shaper and amino-acid chains. It works deep in the fibre to reprogram hair for smoother, frizz-free, volume-controlled results that build with every weekly use, all while preserving the hair's integrity. Suitable for all hair types including coloured hair, alcohol-free and artificial colourant-free.
Product Details and Benefits
- Patented smoothing technology powered by Keratin-Alpha Shaper and amino-acid chains that reprogram hair at the Keratin Alpha level — the deepest layer of the fibre — rather than just coating the surface.
- Progressive by design: the more you use it, the smoother hair gets, with results peaking after 4 weekly applications.
- Delivers 5x smoother hair* and +77% instant shine*, all while preserving the hair's integrity.
- Used as part of the full Keratin Alpha Sleek routine, it helps transform hair for 2 weeks of smooth, frizz and volume control, with 2x less frizz and daily styling in half the time.**
- Suitable for all hair types, including coloured hair. Alcohol-free and artificial colourant-free.
- Has a distinctive scent that comes from its potent smoothing actives — it rinses away and is completely safe to use.
- 200ml.
How to Use
- Shake well, then apply to clean, towel-dried hair. Section into two and work it evenly from lengths to ends — roughly 30 to 50g depending on how thick and long your hair is.
- Leave it on for 10 to 15 minutes. No need to go longer; results peak right at the 15-minute mark.
- Rinse, then blow-dry fully — and finish with a flat iron if you want it to last — to activate the smoothing technology. Use once a week; on other wash days, reach for the Keratin Alpha Sleek Mask instead.
Pro Tip: Because the results are progressive and peak after four weekly uses, time your first application about a month out from a big event — a wedding, or a holiday somewhere humid — so your hair hits peak sleekness exactly when you want it most.
Why You'll Love It
This is the step that turns "smooth for a day" into "smooth for weeks" — the treatment doing the structural heavy lifting behind every glossy, frizz-free result. Add it to your cart and let your hair learn a sleeker way to behave.
*5x smoother hair and +77% instant shine are based on instrumental testing of the Smooth Transformer. **The 2 weeks of smooth, frizz and volume control, 2x less frizz, and halved daily styling time reflect the full Keratin Alpha Sleek routine (Shampoo + Smooth Transformer + Serum) after 4 applications, not the treatment used on its own. Source: L'Oréal Professionnel, lorealprofessionnel.com.
