Smoother, straighter hair is the number one most requested service in the salon¹. In fact, 50% of clients say they’re worried about frizz, dryness, or manageability¹. And while many ask for a service to make it "straighter,” what they really want is smoother, easier to manage hair—not permanently flat, lackluster strands.

So what’s the difference between straightening and smoothing? And where does SmoothFiller fit in? We’re breaking it down.

Straight Hair vs. Smooth Hair

Traditional straightening services are designed to alter the natural structure of the hair. The goal is often to eliminate curls or waves and create a permanently straight result. This often comes with longer appointment times, multiple steps and products, a great deal of post-service restrictions (like no washing, working out or ponytails), and, most challenging, a visible line of demarcation as the hair grows out.

For years, keratin-based treatments have dominated this category. But with growing concerns around ingredients, fumes during heat activation, lengthy procedures, and strict aftercare, these services are less and less appealing. In fact, while texture remains a top concern, not many clients actually opt for traditional keratin-style treatments.

Clients today are looking for services that are low-maintenance and can deliver reduced frizz, faster and easier styling while maintaining natural movement without completely changing their lifestyle habits. So, if that’s your goal smoothing, not straightening, should be on your radar.

What SmoothFiller Is Designed to Do

SmoothFiller is a salon-exclusive, demi-permanent smoothing service created to improve manageability without permanently altering the hair’s natural texture. The formula does not contain keratin or protein. Instead, through thermal activation, its Smart Delivery System delivers the active ingredient into the hair fiber, where it fills porosity gaps by forming new, stable bonds within the hair’s protein structure.

Porosity gaps can contribute to frizz and make styling more difficult, particularly in humid conditions. By reinforcing the hair internally rather than coating the surface, SmoothFiller helps reduce frizz and support easier styling. Results can last up to three months and gradually soften over time without visible regrowth. And for curly/coily hair, SmoothFiller provides softness and easier manageability while maintaining the hair’s natural pattern.

No Post-Service Restrictions

One of the clearest differences between SmoothFiller and many traditional smoothing treatments is what happens after the appointment. SmoothFiller doesn’t have limitations. Clients can wash their hair, work out, or even swim the same day.

The formula contains only eight carefully chosen ingredients and is silicone-free, mineral oil-free, fragrance-free, vegan, and low-fume. The service is completed in under two hours, with a 20-minute processing time and no additional rinsing required after heat activation. So, instead of adding restrictions, the service is designed to fit into the client’s existing routine.

Designed to Work With Color

SmoothFiller can be performed the same day as color services, allowing smoothing and color to be completed within one appointment. Grey coverage and lightening services³ such as highlights or balayage should be completed before the smoothing service.

Glossing² can be applied immediately after SmoothFiller, allowing the finish to be refined in the same visit. It can also be incorporated into a combination of color techniques, giving stylists flexibility without requiring a separate booking.

Who Is SmoothFiller For?

SmoothFiller is ideal for clients who want hair that feels easier to manage. It works especially well for hair that’s naturally frizzy, hard to control, frequently heat styled, or impacted by humidity. These are the clients who want smoother results and faster styling, without committing to permanent straightening. By reinforcing the hair internally, the service helps create smoother results with natural movement.

How It Fits Into Your Salon

  

SmoothFiller also changes how smoothing will fit into your salon menu. The service uses one product and a 20-minute processing time. Because it can be applied alongside color, it doesn’t require a separate appointment and can simply be added to appointments that are already booked. And with a recommended service price of $150 to $300, just five smoothing services per week can translate to as much as $78,000 in added annual revenue. Rather than replacing existing services, SmoothFiller enhances what you can already offer within the same appointment, increasing your ticket value without extending your day.

Straight or Smooth?

If a client is looking for a permanent change to their curl or wave pattern, a traditional straightening system may still be the right direction. But for clients who want reduced frizz, easier styling, and smoother results without post-service restrictions, smoothing offers a more flexible option. SmoothFiller was designed exactly for that by delivering smoother hair and easier manageability for up to three months, with a finish that gradually grows out over time.

Extending the Smooth with ULTIMATE SMOOTH

The impact of SmoothFiller doesn’t end when the appointment does. Maintaining a soft, controlled finish between visits depends on how the hair is cared for at home.

ULTIMATE SMOOTH is designed to support ongoing manageability, shine, and long-lasting smoothness as part of a consistent routine. Starting with ULTIMATE SMOOTH Shampoo and Conditioner, hair is gently cleansed while helping remove metal buildup and replenish moisture for a smoother, more polished feel. For clients who need additional smooth, the ULTIMATE SMOOTH Mask can be used weekly to restore smoothness and enhance shine in hair prone to frizz or dryness.

To finish, the ULTIMATE SMOOTH Miracle Oil Serum nourishes hair in 30 seconds while providing heat and UV protection, helping maintain smoothness that lasts up to 3 days⁴,  for  96 hours of frizz control⁵, and up to 85% smoother hair⁶. Formulated with Squalane and Omega-9, it supports softness and manageability without weighing the hair down.

Together, SmoothFiller and ULTIMATE SMOOTH create a natural transition from in-salon service to at-home care, so hair continues to feel controlled, polished, and easy to style for longer.


 

¹Source: H&P Care 2022, 8 countries (US BRA MX IT UK DE CHN JP), Women 15+ users of hair category / Circana US/ UK/ Germany 2023. H&P Styling US UK DE. Usage in the P12M
²Shinefinity and BlondorPlex Cream Toners are not recommended right after Smoothfiller They are safe to use; however, the tone will not be as rich/not true-to-tone as expected.
³When using BlondorPlex, do not use WellaPlex No. 2. Up to 97% less breakage results are not guaranteed.
⁴If unwashed for 3 days vs. untreated
⁵When using Miracle Oil Serum
⁶ Vs. non-conditioning shampoo