Does Tria 4X laser give permanent results?

A closer look at Tria Beauty UK's claim that the Tria 4X laser gives permanent hair removal; comparisons contradictions, and what the evidence really says.
Is the Tria 4X laser hair removal permanent?
By Laura Gladman
March 20, 2020

Now, given the choice I’d choose ‘permanent hair removal’ over ‘permanent hair reduction’. Removal sounds heaps better than reduction, doesn’t it? And that’s what Tria Beauty UK say you’ll get with the Tria 4X laser.

They say:

“Tria’s advanced hair removal devices offer a safe, at-home permanent hair removal solution, whereas IPL offers permanent hair reduction.”
Tria Beuty UK say the Tria 4X laser gives you permanent hair removal, whereas IPL devices only give hair reduction - learn if that's so in this review of the claims and evidence by
The Tria 4X laser gives you permanent hair removal – fact or no?

But hold on a tick.

Now I’ve learned all there is to know about professional and at-home laser hair removal. I’ve read countless research papers, studies and regulatory guidance. And you can find a truckload of helpful articles on this website with all I’ve learned about laser & IPL removal. And it’s this in-depth knowledge which raises a few questions (and eyebrows) about Tria Beauty’s claim. So, I dug a little deeper to see if this claim really is true.

Here are my questions and concerns we’ll discuss in this article:

1. Even laser professionals don’t claim permanent hair removal.

So how can Tria Beauty UK make this claim? Learn more

2. Tria Beauty themselves contradict this claim.

A look at what Tria say in their website disclaimer. Lemme see!

3. The claim contradicts FDA guidelines.

The FDA regulates the claims you can make about laser hair removal and they say you can’t say this. What’s up with this?

4. How do you even get permanent hair removal anyway?

To truly claim permanent hair removal you must remove or totally destroy the hair follicle. Laser and IPL hair removal does not do this. More on this.

5. Lasers are different & better then IPL. Really?

Tria Beauty emphasize the laser’s key differences to IPL (but this doesn’t mean it’s permanent). Learn more

6. Tria’s clinical study doesn’t prove it’s permanent.

The 2012 study Tria share as evidence proves permanent hair reduction, and not permanent hair removal. Huh? – check it out.

So, let’s find out if the Tria 4X really will give you permanent hair removal.

#1 Tria laser vs professional laser hair removal claims

Most reputable aesthetic clinics say laser hair removal gives permanent hair reduction results. Some say up to 90% “permanent hair reduction that lasts”1,2. It’s an accepted industry term.

Now, the Tria 4X uses the same (but less powerful) Diode laser technology as in some of these clinics. So, it doesn’t make sense that Tria claim permanent hair removal when even the professionals don’t.

Screen grab from (Feb 2019) reading "*Because Diode Laser technology is proven to permanently remove hair, users may find they can stop regular treatments altogether after three to six months, with the occasional top-up if required." states Diode laser is proven to permanently remove hair. But clinical studies prove permanent hair reduction, not removal.

Tria also state that Diode laser technology is clinically proven to permanently remove hair. However, all the clinical studies I found prove permanent hair reduction, just like IPL devices. So, it’s unclear what proof Tria refer to here.

This statement also references an interesting footnote, which we’ll look at next.

#2 Tria’s contradictory website disclaimer

Copy from Tria: *Because Diode Laser technology is proven to permanently remove hair, users may find they can stop regular treatments altogether after three to six months, with the occasional top-up if required, and the related footnote: *Using the Tria Hair Removal Laser as directed for at least 12 treatments, most users will achieve a substantial visible reduction in hair regrowth, and additional treatments may result in additional reductions. Depending on skin tone, hair colour, body part, treatment level, and other factors, individual results from laser hair removal may range from complete reduction to little or no reduction.
The small print covers all possible outcomes from zero results to complete hair reduction.

This small and interesting disclaimer sits at the bottom of the ‘Laser vs IPL’ information on

The disclaimer says:

“Using the Tria Hair Removal Laser as directed for at least 12 treatments, most users will achieve a substantial visible reduction in hair regrowth, and additional treatments may result in additional reductions. Depending on skin tone, hair colour, body part, treatment level, and other factors, individual results from laser hair removal may range from complete reduction to little or no reduction.”

Tria Beauty UK ‘Laser vs IPL’


That’s confusing, but this is how I understand it. After 12 treatments of use, at best you’ll get awesome hair reduction results. At worst, it may do nothing. Or anything in between. Because results vary by individual.

It seems to me Tria are covering all bases, but heavily promoting only the very best outcome, designed to grab your attention. I feel it’s misleading and sets potentially harmful expectations based on the promise of ‘permanent hair removal’.

#3 Contradicts FDA regulation

Next, it’s noteworthy that only Tria Beauty UK make the claim the Tria 4X gives permanent hair removal. Tria Beauty in the US does not make this claim.

Why is this?

US Food & Drug Administration logo
The FDA states and regulates laser & IPL devices give permanent hair reduction (not removal)

In the US, home IPL and laser hair removal machines are regulated by the Food and Drug Administration (FDA). The FDA protect the US nation’s health by making sure medicines and medical devices are safe. Before a professional or home-use device is sold or marketed in the US, they must have FDA approval or clearance. This means the manufacturer must submit evidence it’s effective, safe and the benefits outweigh the risks.

The FDA also control the indicated use and claims that brands and manufacturers can make about the results. therefore, manufacturers get permission (or clearance) to market their devices for ‘permanent hair reduction’4.

“Several manufacturers received FDA permission to claim, “permanent reduction,” NOT “permanent removal” for their lasers. This means that although laser treatments with these devices will permanently reduce the total number of body hairs, they will not result in a permanent removal of all hair. “

FDA ‘Laser Facts’ consumer webpage, since removed but available on Wayback Machine here

Therefore, the Tria 4X laser has FDA clearance for permanent hair reduction. So, in the US, that’s how Tria must promote it because they aren’t allowed to say the 4X laser gives permanent hair removal.

But in the UK, the FDA has no jurisdiction. So, Tria Beauty UK decided to use this claim to grab your attention.

And that it does. But as we’ve just learned, not even professional clinics claim permanent hair removal. And although Tria UK do claim permanent hair removal, they also caveat it with small print saying results vary from zero to complete hair reduction which doesn’t sound like the promise of permanent hair removal to me.

Next, I think it’s wise to asks what permanent hair removal really means.

#4 How to get permanent hair removal?

To confidently say hair is permanently removed, the hair follicle must be entirely destroyed. Then there’s no way the hair can grow back. And only electrolysis does this3.

Illustration of human hair in the 3 growth stages, 1 Anagen growth stage, 2 Catagen growth stops and follicle and hair retract, 3 Telogen follicle inactivity and hair falls out, back to early Anagen where the follicle connects to the dermla papilla again and hair grows.
The hair follicle grows new hairs, so you must destroy it to permanently remove hairs.

Laser hair removal sends focused light energy to your hair root, which heats up the melanin there and in turn damages key areas in the follicle. This causes the hair to stop growing and enter the dormant stage (called Telogen phase). Intense Pulsed Light uses the same process (but with a broad-spectrum light energy). The end result for both is the same. A dormant hair follicle in the resting phase.

But the hair follicle is still there and intact. Therefore, with both laser and with IPL the follicle can heal, become active again and hair could grow back.

Therefore it seems impossible to say the Tria 4X laser permanently removes hair because the follicle is still there.

So, what the..?

Yep, it’s no clearer. According to the Adverting Standards Authority, Tria Beauty must ‘hold evidence to support their claims’ for permanent hair removal. So, I asked Tria Beauty UK to help clear it up.

#5 Tria explains why lasers are best

I asked Tria Beauty UK for any data or studies they have supporting their claim the Tria 4X laser gives permanent hair removal.

I got a quick response. They shared a clinical study report by Ronald G Wheeland (which we’ll look at later), and a thorough explanation on the differences between laser and IPL and why laser is better. Let’s look at this now.

Home laser vs IPL explanation

Most of the the information Tria shared with me is factually correct. But none of it proves permanent hair removal.

Tria first explained the 4X is so effective because it’s a solid-state Diode laser producing energy at 810 nanometers, which is infrared light. This reaches deep to the hair root where melanin in the hair absorbs this wavelength and converts to heat. This information is all correct and true.

They then explain IPL is different because it uses light of many colours, which appears white to our eyes. The different colours reach different depths in your skin and melanin doesn’t absorb all the colours. These differences with IPL are also true. However, none of these facts mean IPL is less effective.

'Selective' means the chromophore only and not the surrounding tissues. Photothermolysis: 'Photo' means melanin absorbs light photons, 'thermo' means the absorbed light transfoems to heat, and 'lysis' means the heat destroys target cells.
Both laser & IPL work with the same principle of selective photothermolysis.

But then they share some negatives of IPL. They go on to say your skin may absorb some of the IPL light causing undesirable heating. Here, they imply compared to laser, IPL is less safe and can hurt. However, skin heating is a safety concern for darker skin tones only. And most IPL devices won’t flash if your skin is too dark. They also have gentler IPL intensity levels and filters for safety and comfort on darker skin, whilst the Tria 4X is safe for light skin tones only. So, it’s not a totally fair statement.

Tria finally say the properties of IPL may also mean it’s less effective for hair removal. And this certainly makes you want the Tria 4X laser more. But there’s nothing to back this up, no sources or evidence. I also asked Tria Beauty if they had a comparison results study for the Tria 4X and any home IPL devices. They didn’t share anything 👎.

However, comparison clinical studies with professional grade machinery show there’s no clinically significant difference in results between laser and IPL. Learn more in laser vs IPL compared.

Tria directed me to the full information on the website too. info

CAN LASER OR IPL TECHNOLOGY PERMANENTLY REMOVE HAIR? 1) DIODE LASER TECHNOLOGY: The Diode Lasers specific wavelength is optimised for hair removal. *The laser beam allows for very deep, more powerful and precise penetration as the energy is targeted directly to the hair follicle, achieving accurate, permanent results. Once the hair follicle has been disabled, it loses its ability to regrow hair. 2) INTENSE PULSED LIGHT (IPL) TECHNOLOGY: IPL can reduce and slow down hair regrowth but not permanently remove hair. Only a small percentage of the IPL energy is effectively absorbed by the hair follicle to achieve hair reduction. Therefore more and regular treatments are being needed, as thicker and deeper hair follicles might not be reached and disabled effectively.
Tria 4X Diode laser vs IPL.

Tria also dedicate a whole web page to laser vs IPL and why they say the Tria laser technology is superior to home IPL. But, again there are no sources or evidence to back the claim it gives permanent hair removal. And, rather unshockingly, it’s somewhat bias in favour of their Tria 4X laser.

For example, Tria says with IPL “some users may feel an increased level of discomfort” because the diffuse light energy travels through your skin creating heat.

With the Tria on the other hand “some users might feel the sensation of a rubber band snapping against the skin or a warm pricking feeling, while others report no discomfort”. The Tria certainly sounds more comfortable here, however, there are many more user reviews saying the Tria 4X hurts more than a bit than compared to home IPL reviews.

But there is one bit of information logically suggesting the Tria does give better results than IPL. That’s the fact the Tria is three times more powerful than the most powerful home IPL.

Graph showing the Tria 4X laser is 3 times more powerful than the most powerful home IPL (Philips Lumea Prestige at 6J/cm2)
From Tria Beauty UK website

All manufacturers agree and advise the higher intensity levels give faster and longer lasting results. So, it follows the Tria 4X gives better results than lower intensity IPL devices. But this still doesn’t prove permanent hair removal.

Related: compare the pros & cons of the Tria 4X vs my favourite home IPL

And finally onto the clinical study report Tria Beauty share as proof of permanent hair removal.

#6 Tria’s Wheeland Clinical Study 2012

Tria Beauty UK also sent me a PDF version of their clinical study called “Permanent Hair Reduction with a Home-Use Diode Laser: Safety and Effectiveness One Year after Eight Treatments”6.

So, what does it prove?

In this 2012 study, the Tria 4X laser was tested on 13 subjects. Each had three test sites on their leg, one per intensity level plus an untreated control site. They had 8 monthly treatments, with intervals of follow-up hair counts up to 12 months after the treatments. The study is interesting, comprehensive and thorough with reassuring results.

Mean Average hair reduction percentages:

Time after 8 treatments Low intensity (7 J/cm2) Medium intensity (12 J/cm2) High intensity (20 J/cm2)
1 month after 8 sessions 47% 55% 73%
12 months after 8 sessions 44% 49% 65%

Also, 38% of subjects had more than 80% hair reduction at 12 months after the 8th treatment. This includes 1 subject who has 100% hair reduction. Impressive.

The study also states that after 8 sessions at the higher intensities, most users will need to shave less, if at all. That’s because of the high hair reduction rate and evidence that regrowth is finer, lighter and less noticeable.

In addition, two of the study subjects returned after a further 12 months for an unscheduled hair count session. They showed a consistent 100% and 93% hair reduction. The study therefore concludes, because they maintained their results from the 1-year time point, this is “further indication of the permanence of the results”.

It’s convincing, but does this prove permanent hair removal?

No. This still proves permanent hair reduction at least 12 months post-treatment. Or as the study concludes, this means…

“[the Tria 4X] effects a stable, long-term reduction in the number of hairs that meets the FDA and industry definition of permanent hair reduction.”

Ronald G Wheeland, 2012 report

And even though the study suggests the results appear to be of a ‘permanent nature’, permanency is not proven.


Psst: Also noteworthy, are the findings from a recent study into the long term results of home IPL hair removal.

The study shows that after 1 year of top-up sessions (approximately 8 sessions), hair reduction remains high and lasts for at least 12 months without further top-ups. These results are comparable to the Tria 4X laser results in the Wheeland study.

Related: long-term results with home IPL

So, is Tria 4X laser hair removal permanent?

The clinical study shows that one participant did get 100% hair reduction, and it lasted 1 year. But does this mean you will?

I think the online feedback is most helpful here.

These show results vary by user. Some get significant results in a few goes and are hair free soon after. For others it takes much longer. Some never get to totally hair free. And results last different amount of times too.

For some the hair hasn’t grown back after a few months, for others it’s years. For others it grows back if you stop regular use. And some are still using it regularly a year or so later.

And here’s the kicker.

The user feedback for the Tria 4X laser matches most other home IPL devices too. Therefore, don’t choose the Tria 4X based on the “permanent hair removal results” alone. Consider all aspects of the device, and compare it to home IPL too so you can confidently choose the best one for your lifestyle and treatment areas.

In conclusion

In the Tria 4X user manual it states the Tria is "intended for permanent reduction in hair regrowth defined as long term, stable reduction in the number of hairs regrowing when measured out to 6, 9 and 12 months after completion of the treatment regime."
Tria say you’ll get permanent hair reduction in their user manual.

“Permanent hair removal” is an attention-grabbing statement. And some people will choose the Tria 4X laser over other choices simply because of this promise.

But it’s not so certain. My doubts are…

👉 Firstly, not even professional clinics claim permanent hair removal so how can Tria?

👉 Second, the FDA states you mustn’t make this misleading claim in the US, so Tria do so in the UK only.

👉 Next, Tria UK also acknowledge results vary from zero to complete hair reduction, which contradicts the promise of permanent hair removal.

👉 And lastly, removing the hair follicle as with electrolysis, is the only way to confidently claim permanent hair removal. But because the Tria 4X laser leaves the hair follicle intact, it could grow new hairs again.

Because of these things I think the claim is more a marketing hook than a given fact. And after investigating and researching the evidence from Tria, there are further holes in the claim.

🧐 Tria’s rationale is laser is superior to IPL, but their explanation is incomplete, lacks evidence and doesn’t prove permanent hair removal.

🧐 The clinical study shows impressive results and suggests it’s “permanent in nature”. But ultimately it proves permanent hair reduction, and not permanent hair removal.


The Tria 4X is a super device. It works very well for small body areas. And it’s the most powerful to give you longer-lasting results. But in practise, IPL is much less effort because sessions are considerably faster. And the end results are similar, if not the same.

Therefore, don’t buy on the permanent hair removal promise alone. Assess the pros and cons, and compare to home IPL devices. That way you’ll choose a device you’ll stick with and get super smooth skin results.

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Post sources & references:
  1. Sk:n clinics laser hair removal
  2. Mayo clinic: Laser hair rmeoval
  3. FDA website via Wayback machine “Removing hair safely: Epilators: Needle, Electrolysis, and Tweezers”
  4. FDA website via Wayback Machine “Laser facts: Hair removal”
  5. ASA website: Hair removal advice online
  6. Tria Beauty UK website: Permanent Hair Reduction with a Home-Use Diode Laser: Safety and Effectiveness One Year after Eight Treatments, Ronald G. Wheeland, MD, FACP
  7. Tria Beauty UK website: Laser vs IPL
Laura Gladman
I'm a bit obsessed with at-home beauty devices. It's a habit I've had for around 9 years now. I love the science, testing and reviewing them, and sharing my experience and feedback on my site I'm also a crazy dog lady, and I don't care.

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