How long does keratin smoothing last?
Keratin smoothing lasts 2 months to 5 months depending on treatment type: Straight Up Smoothing 8–12 weeks, traditional keratin or QIQI Vega 3–4 months, Nanoplasty up to 5 months, and Brazilian Blowout 2–3 months. The single biggest factor determining duration is whether you use sulfate-free shampoo — sulfates dissolve the treatment and cut results by up to 70%.
'How long does keratin smoothing last?' is asked before almost every booking. The honest answer: anywhere from 4 weeks to 5 months — it varies more than any other treatment category. Here's what actually controls it, and how to maximise your result.
By Treatment Type
Straight Up Smoothing (amino-acid based): 8–12 weeks. QIQI Vega / traditional keratin: 3–4 months. Nanoplasty: up to 5 months. Brazilian Blowout: 2–3 months. These are maximums with proper aftercare — realistic averages are often 20–30% shorter. If someone tells you 'keratin lasts 6 months', they're describing the absolute best case, not the average.
The Single Biggest Factor: Aftercare Shampoo
Sulfate shampoos dissolve smoothing treatments. Every wash with a sulfate shampoo shortens treatment life by days. Using a drugstore shampoo can turn a 12-week treatment into a 4-week treatment. The difference between clients who love their smoothing and clients who feel ripped off is almost always aftercare shampoo. Use QIQI Bare Repair, Pure Sacred, or any genuinely sulfate-free option.
Book a Straight Up Smoothing appointment
Learn more about this service or book your appointment today.
Other Factors That Shorten Treatment Life
Chlorine pool water (wear a swim cap or wet hair with clean water first). Sun exposure (UV breaks down treatment — use a UV filter leave-in). Heat styling above 200°C (cumulative damage to the treatment layer). Saltwater swimming (rinse thoroughly after). Hard water in Sydney (monthly clarifying mineral-removing treatment helps). Daily washing (stretch to every 3–4 days minimum).
Factors That Extend It
Washing every 3–4 days instead of daily. Sulfate-free shampoo only. A leave-in conditioner (Pure Precious Ends or similar) after each wash. Silk pillowcase to reduce friction. Heat protection spray before any hot-tool styling. Weekly bond-repair mask (Juuce Bond Repair) to keep the treatment layer intact. Clients who follow all six get the advertised duration. Clients who skip most get a fraction.
When to Book Your Refresh
Signs you need a refresh: frizz returning in humidity, hair feeling less manageable at the mid-lengths, blow-dry time increasing back to pre-treatment levels. Don't wait until it's completely gone — book when you're 70–80% to that point so you never fully lose the result. Most Hair Pinns clients book refreshes at the 10-week mark for Straight Up, 14-week mark for QIQI Vega.
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Key Takeaways
- Straight Up 8–12 weeks, QIQI Vega 3–4 months, Nanoplasty up to 5 months
- Sulfate-free shampoo is the #1 factor — drugstore shampoo kills treatments fast
- Chlorine, sun, heat above 200°C, and hard water all shorten results
- Leave-in + silk pillowcase + weekly bond mask = advertised duration
- Book your refresh at 70–80% fade, not 100% — never fully lose the result
Book a Straight Up Smoothing appointment
Learn more about this service or book your appointment today.
Frequently Asked Questions
What is keratin smoothing?
A chemical service that uses keratin protein to fill gaps in the cuticle and seal the hair shaft. Hair comes out frizz-free, smoother, and easier to blow-dry. Lasts 3-6 months.
How much does keratin smoothing cost in Sydney?
From $200 (short) to $450 (long), depending on hair length, density, and the specific treatment. Hair Pinns publishes prices online and offers free in-salon consultations.
Is keratin smoothing the same as a Brazilian Blowout?
Brazilian Blowout is a specific brand of keratin treatment. They're a subset of keratin smoothing, not a separate service. Jena offers both Brazilian Blowout and in-house keratin treatments.
Does keratin smoothing damage hair?
Modern formulas don't — the keratin actually adds protein to the hair shaft. The only damage risk is from over-processing, which is why Jena does a strand test before the full service.
How long does keratin smoothing last?
3 months on fine hair, 6 months on coarse or virgin hair. The treatment grows out with your natural curl, so it doesn't 'end' — it gradually returns at the root.
