ACHIEVE SMOOTH, FRIZZ-FREE HAIR WITH WELLA SMOOTH FILLER KERATIN TREATMENT

What is Smooth Filler, and Why is Everyone Talking About it?

If frizz, humidity, or high-maintenance styling routines are standing between you and great hair days, Wella’s brand-new Smooth Filler keratin treatment is the solution you’ve been waiting for.

Smooth Filler is a professional in-salon treatment that smooths, strengthens, and transforms your hair in as little as two hours. Unlike traditional keratin treatments, it has immediate results, no restrictions, and no harsh chemical smell, just smoother, shinier and healthier-looking hair from the very first appointment.

What Makes Smooth Filler Different From Other Keratin Treatments?

Most clients have heard of keratin smoothing, but Smooth Filler takes it to the next level:

• No restrictions: You can wash your hair, work out, or even get caught in the rain the same day, it won’t affect your results.
• No sulphate-free shampoos needed: You can carry on using your favourite professional haircare products.
• No strong odour or eye watering: The experience is far more comfortable compared to older keratin treatments.
• Fast and efficient: The service takes around 2 hours, making it easier to fit into your routine.
• Colour-friendly: Smooth Filler can slightly brighten your hair tone, so your stylist will plan your colour and smoothing services together for the best results.
• Long-lasting: Results last up to 3 months, with recommended rebooking every 12 weeks.

Our CEO Tash, has tried out this service for herself:

‘’I’ve had keratin treatments for years, but Smooth Filler is on a completely different level. My eyes didn’t water once, there was no scent, and my hair feels incredible, smooth, light, and healthy without any heaviness. The fact that there are no restrictions afterwards is game-changing. It’s by far the best smoothing treatment I’ve ever had.”

Can a Keratin Treatment Help with Hair Growth?

One of the most frequent questions we get at HOB Salons is whether a keratin smoothing treatment can actually help your hair grow faster or appear thicker. The short answer? While keratin treatments aren’t technically a “hair growth” solution, they can play a surprising role in helping you achieve longer, stronger, and healthier hair over time.

Here’s why: Frizz control, breakage, and split ends are some of the biggest culprits when it comes to slow hair growth or hair that never seems to get past a certain length. By smoothing the hair cuticle to promote smooth hair and reinforcing your strands, a professional keratin treatment like Smooth Filler dramatically reduces friction and breakage, especially during brushing and blow drying, ultimately benefiting the overall health of your hair!

For clients with fragile, colour-treated, or naturally coarse hair, this means less snapping and fewer split ends between salon visits. The result? You’re able to retain more length as your hair grows, so those “invisible inches” finally become visible.

Plus, a smooth surface means less heat is required to style your hair, further protecting it from damage. And while keratin itself doesn’t change your rate of hair growth at the root, creating a stronger, more resilient foundation helps every new centimetre count.

How Does the Smooth Filler Keratin Treatment Work?

Step 1: Consultation We start every appointment with an expert consultation. Your stylist will talk through your hair type, texture, and styling goals to personalise the service.

Step 2: Cleanse & Prep Hair is gently cleansed to remove build-up, creating the perfect base.

Step 3: Application

The Smooth Filler formula is applied section by section, targeting frizz and porosity while smoothing the cuticle.

Step 4: Blow Dry & Straightening

Heat is used to lock in the treatment. The root area may need slightly more passes with the straightener, while mid-lengths and ends require fewer, as they’re more sensitised. (Seeing a little steam is completely normal, it’s just moisture and residue lifting away.)

Step 5: Finished Look

Hair is left feeling smooth, light, and glossy, with none of the heavy “coated” feel of traditional keratin treatments.

How Often Should You Get a Keratin Treatment, and How to Make Results Last Longer?

If you’re loving your sleek, frizz-free hair and want to keep the results going all year, it’s natural to wonder: How often should you book in for a Smooth Filler treatment? And once you’ve made the investment, how can you make those salon-fresh results truly last?

How Often is “Just Right”?

For most clients, we recommend booking a Smooth Filler treatment every 3 months to maintain your results. This timing ensures your hair stays smooth, shiny, and manageable.

Factors such as your hair type, lifestyle, and how often you wash or heat-style can influence how long results last, your HOB stylist will always personalise advice for you and is happy to answer any questions you might have.

Many clients find rebooking every 12 weeks keeps their hair consistently frizz-free, while others may choose to align their treatment with colour appointments or before a holiday for maximum impact.

How to Make Your Keratin Results Last Even Longer

Here’s how you can extend that just-left-the-salon smooth look for as long as possible:

• Choose the right shampoo & conditioner: There’s no sulphate-free restriction with Smooth Filler, but for the best results      we recommend Wella Ultimate Smooth to keep hair nourished and frizz-free.
• Join The Blow Dry Club: Regular professional blow dries mean less heat styling at home. Our stylists use the right temperature and technique to protect your results, while keeping your hair polished between washes.
• Protect your hair when swimming: Chlorine and salt water can reduce the longevity of your treatment. Apply a protective spray and always rinse with fresh water before and after swimming.
• Hydrate in-salon: Top up your hair’s moisture and strength with professional in-salon treatments, your stylist will recommend the best one to pair with Smooth Filler for your next appointment.

“One of my clients at HOB Radlett recently had the Smooth Filler treatment and couldn’t believe she hadn’t tried it sooner. The transformation was incredible, she came in with frizzy, straw-like hair and left with smooth, shiny, healthy-looking hair. She loved it so much she’s already booked her next appointment.” – Ilana, Style Director, HOB Salons Radlett

Who Shouldn’t Get a Keratin Treatment?

Keratin smoothing treatments are game-changers for many, but they aren’t the perfect match for everyone. At HOB, our priority is always your hair health, so we’re transparent about who should skip or delay this service.

You Might Want to Wait or Choose Another Option If:

1. You Have Severely Damaged or Over-Processed Hair

If your hair is extremely fragile from frequent bleaching, harsh chemical treatments, or repeated heat styling, even gentle keratin formulas may be too much. In these cases, our stylists will usually recommend a restorative course of in-salon strengthening treatments first, so you can rebuild strength and elasticity before considering keratin.

2. You’re Pregnant or Breastfeeding

While many modern formulas are much safer than past versions, most manufacturers advise waiting until after pregnancy and breastfeeding before getting a keratin treatment. If you’re unsure, our stylists are always happy to walk you through product details and alternatives.

3. You Have Very Fine, or Ultra-Straight Hair

If your hair is naturally very fine or poker-straight and you love your volume, keratin smoothing might make it too flat or sleek for your taste. Your stylist can recommend alternative treatments for naturally curly hair or shine-boosting treatments to enhance your hair without reducing fullness.

4. You Have Certain Scalp Conditions

Sensitive scalps, chronic irritation, or specific skin conditions might not react well to smoothing treatments. If you have any concerns, let your stylist know so they can suggest the safest approach, or consult with your GP or dermatologist beforehand.

Ready to Experience Smooth Filler?

Smooth, frizz-free hair doesn’t have to be a dream. With Wella Smooth Filler Keratin, you can enjoy glossy, manageable results that last up to 3 months, with none of the hassle of old-school keratin treatments.

Book your consultation at HOB Salons today and discover your smoothest, easiest hair yet.

📅 Rebook every 12 weeks to keep your results fresh.

Keratin Smoothing FAQ: Your Top Questions Answered

How long does keratin smoothing last?

Smooth Filler results last up to 3 months. We recommend rebooking every 12 weeks to maintain smoothness, shine, and manageability.

Will my hair look flat or lose volume?

No, Smooth Filler is designed to smooth and de-frizz while keeping your natural movement. You’ll enjoy softer, more manageable hair with bounce and shine, not flatness.

Is it safe for coloured or highlighted hair?

Yes, Smooth Filler is completely safe for coloured or highlighted hair. In fact, it can make colour look shinier and healthier. Your stylist may recommend planning colour and smoothing services together, as the treatment can slightly brighten your tone.

What’s the aftercare routine?

There are no strict aftercare rules with Smooth Filler, you can wash and style your hair as normal straight away, and you don’t need sulphate-free shampoos. For best results, we recommend using Wella Ultimate Smooth at home, along with regular professional blow dries to keep your style looking polished.

How much does a Smooth Filler treatment cost?

Our Wella Smooth Filler treatment starts from £175, with the price varying depending on your hair’s length and thickness. For full details, view our salon price lists.

Need a little more guidance?

Pop in for a complimentary consultation, DM us on Instagram, or give your preferred HOB Salons a call, we’ll match you to your ideal stylist and create a plan for your smoothest hair yet!