2026-10-14

Do Fall Frizz-Free with This Demi-Permanent Hair Smoothing Treatment

Model with long, straight, sleek hair.

September is all about that new season, 'back to school', fresh start feeling (even if your school days are behind you). And, while a little frizz might have passed for beachy texture over summer, autumn is calling for smoother styling, with glossy blow-dries, slicked-back ponies and soft, bouncy curls and coils ranking high this season.

But if darker mornings have you hitting snooze on your alarm, you need a quicker solution to frizz. Smoothfiller is a demi-permanent smoothing service that delivers smoother, more manageable hair, lasting up to four months.

So, whether you're heading back to the classroom, back to the office or simply back to your usual routine, let's explore what a demi-permanent smoothing treatment could mean for your hair this season...

What is Demi-Permanent Smoothing and How Does it Work?

Demi-permanent smoothing treatments, like Smoothfiller, help to reduce frizz, improve manageability, and keep hair smooth in the face of harsher weather without permanently altering your hair's shape and texture. Instead, Smoothfiller refills and restructures the hair fibre from the inside, building bonds that help to control frizz and keep your hair smoother.

Plus, the results gradually fade over time so, unlike permanent straightening treatments, your demi-permanent service leaves none of those telltale grow-out lines. You’ll enjoy up to four months of more manageable, quicker-to-style hair, helping you stay smooth through autumn and winter’s frizz-inducing weather.


Smoothfiller products in the salon.
Model with long, dark brown, frizz-free curls.

How Demi-Permanent Smoothing Compares to Keratin Treatments

Both demi-permanent smoothing treatments and keratin treatments can reduce frizz and make your hair more manageable, but they each approach smoothing in different ways.

Keratin treatments are typically designed to create a sleeker, straighter look by altering the shape and texture of your hair. Depending on whether or not the treatment is permanent, you may experience harsh regrowth lines.

Meanwhile, our demi-permanent treatment, Smoothfiller – which is not a keratin treatment – controls frizz while protecting your hair’s natural texture and movement. Waves, curls and coils are kept intact, but with a smoother finish. And, because it’s demi-permanent, the results of Smoothfiller gradually fade over time, so your natural texture is restored without any telltale regrowth lines at the root.

Who Benefits Most From Demi-Permanent Smoothing Treatments?

If you want long-lasting frizz control without losing your hair’s natural body and movement, a demi-permanent smoothing treatment may be perfect for you.

Smoothfiller is ideal for anyone who wants:

  • Up to four months of more manageable hair with reduced frizz;
  • Anti-humidity benefits that help keep flyaways in check;
  • Faster, easier styling for busy mornings;
  • Cumulative results, so frizzy hair becomes more manageable over time;
  • No post-service restrictions – you can wash your hair as soon as you like with any shampoo;
  • Natural movement that's maintained as the treatment gradually fades;
  • A low-fume, odour-free, silicone-free, mineral oil-free and vegan service;
  • Colour and smoothing in the same appointment – Color Touch can be applied straight after Smoothfiller

In other words, it's a great fit for anyone whose autumn schedule could use one less thing to worry about. Basically, all of us.


Four models, each with smooth, frizz-free hair after a Smoothfiller service.

What Happens During a Smoothfiller Service?

Before you head to your nearest Wella salon, find out what to expect from your Smoothfiller service. This three-step process makes smoothing simple and stress-free – perfect for streamlining your morning routine.

Step 1: Preparation


A model’s hair is washed at the sink.

Your Wella stylist will begin by washing your hair to remove any buildup and create a clean base for the treatment. They’ll then blow-dry your hair until it’s around 80% dry, leaving it slightly damp and ready for Smoothfiller to be applied.

Step 2: Application


Smoothfiller solution is brushed through model’s hair.

Next, Smoothfiller is applied evenly through the hair, avoiding the scalp. Your stylist will leave it to develop for 20 minutes, giving the formula time to work through the hair. Once the development time is complete, the product is thoroughly rinsed out.

Step 3: Activation


Model’s hair is flat ironed to activate the Smoothfiller treatment.

With the treatment rinsed out, your stylist will blow-dry your hair until it’s completely dry. They’ll then work through the hair in small sections with straighteners, making multiple passes to activate Smoothfiller’s smoothing technology. Once the heat-activation process is complete, your smoother, more manageable hair is ready to style.


Demi-Permanent Hair Smoothing FAQs

What Is a Demi-Permanent Hair Smoothing Treatment?

A demi-permanent hair smoothing treatment is a professional service designed to reduce frizz and make your hair more manageable while respecting its natural texture and movement. Results fade gradually so you don’t see any telltale regrowth lines.

How Long Does a Demi-Permanent Hair Smoothing Treatment Last?

It depends on the treatment, but Smoothfiller delivers smoother, more manageable hair for up to four months. Results gradually fade over time as your natural texture returns.

What Is the Healthiest Hair Smoothing Treatment for Frizzy Hair?

There isn't one smoothing treatment that's healthiest for everyone. A demi-permanent smoothing treatment can be an option for reducing frizz while allowing your natural texture and movement to return over time.

Is a Demi-Permanent Smoothing Treatment Safe for Colour-Treated or Chemically Processed Hair?

Smoothfiller is suitable for colour-treated and chemically treated hair. You can even have your hair coloured in the same appointment with demi-permanent Color Touch. So, not only will you start the season with smoother, more manageable hair, but that autumn-ready colour switch you've been debating will be possible too.

Talk to Your Stylist About Demi-Permanent Smoothing Treatments

Ready for a smoother start to the season? Head to your nearest Wella salon to find out whether Smoothfiller is right for your hair, and discover a more manageable approach to your new-season hair routine.



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