Duration guide
How long does a keratin treatment last?
Up to 5 months. That is the correct answer — but only if you use a sulphate-free shampoo. With a regular shampoo, the same treatment can fade in 4–6 weeks.
Here is exactly what affects duration and what you can control.
With sulphate-free shampoo
4–5 months
With regular shampoo
4–6 weeks
Average first treatment
3–4 months
Average after 2nd+ treatment
4–5 months
What actually makes it last.
A keratin treatment works by restructuring the disulfide bonds inside the hair shaft. Once heat has sealed the treatment in, the result is genuinely structural — the hair is physically different, not just coated.
The problem is that sulphate shampoos are surfactants — they are very good at stripping things from surfaces, including the inside of a hair shaft. Every wash with a sulphate shampoo actively removes some of the keratin structure you paid to put in.
This is not a small effect. Research consistently shows sulphate-free users get 3–4x longer results than those using standard shampoo. If someone tells you their keratin treatment "wore off after a month", ask what shampoo they used.
The second factor is the product itself. Salon-grade cysteine treatments like QIQI Hair Controller penetrate the hair cortex more deeply than budget alternatives, which means they last longer.
What shortens results.
Sulphate shampoo
Critical — reduces 5 months to 4–6 weeks
Switch to sulphate-free shampoo from your first wash.
Swimming in chlorine or salt water
Moderate — each session strips keratin noticeably
Wear a swim cap or rinse immediately after and reapply conditioner.
Daily heat styling without protection
Mild — excessive heat opens the cuticle over time
Use a heat protectant spray before blow-drying and ironing.
Friction (cotton pillowcase, towels)
Minor — abrades the cuticle gradually
Sleep on satin or silk. Pat dry with microfibre.
The aftercare solution
Use the right shampoo. Get the full 5 months.
QIQI Smooth Service Shampoo is sulphate-free and formulated specifically for post-keratin hair. It cleans thoroughly without stripping the treatment. Sodium chloride-free. Gently pH-balanced. 95% of users reported nourished, smoother hair after a single wash.
Available in 75ml (travel), 300ml (daily), and 1000ml (professional). If you want your results to last the full duration, this is the most important product purchase you can make after your treatment.
Keratin treatment duration — FAQ
How long does a keratin treatment last?
A professional keratin treatment lasts between 3 and 5 months. The most important factor is whether you use a sulphate-free shampoo — sulphates strip keratin treatments rapidly. With the right shampoo, results easily reach 4–5 months.
What makes a keratin treatment wear off faster?
Sulphate shampoos are the main cause. Sulphates are powerful surfactants that strip the keratin structure out of the hair shaft with every wash. Regular shampoo can reduce a 5-month treatment to 4–6 weeks. Swimming in chlorinated or salt water also accelerates fading. Frequent heat styling without protection contributes too.
How do I make my keratin treatment last longer?
Switch to a sulphate-free shampoo from your very first wash after the 72-hour waiting period. This is the single biggest variable. Avoid chlorinated pools or wear a swimming cap. Use a heat protectant before blow-drying. Sleep on a silk or satin pillowcase to reduce friction.
Does keratin treatment wear off all at once?
No. Keratin treatments fade gradually as the hair grows out and as the treatment is washed away over time. You will notice frizz returning first at the roots (new growth) and gradually along the length. There is no sudden "expiry" — the fade is slow and steady.
Can I do a keratin treatment again before it fully wears off?
Yes. Many people reapply every 3–4 months. You do not need to wait for the treatment to fully fade. If your hair has been bleached or chemically processed in the last 4 weeks, wait before reapplying.
Does the first keratin treatment last as long as subsequent ones?
Often, subsequent treatments last longer. The first treatment restructures the hair shaft — following treatments build on that foundation. People who treat consistently often report results lasting 5+ months after the second or third application.
How long does a DIY keratin treatment at home last vs a salon?
The same. The duration depends on the product and aftercare — not who applies it. QIQI Hair Controller applied at home using the correct method lasts exactly as long as the same product applied by a hairdresser.
Get 5 months of results.
QIQI Hair Controller + sulphate-free shampoo. The combination that makes results last. Free UK delivery over £80.