Comparing Tria's 4X Vs Silk'n's SensEpil Permanent Hair Removal

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The Tria 4X and the Silk'n SensEpil are two methods of permanent hair removal. Learn about the main differences between their technology, life, results, pain, and cost. The latest Tria 4X (marked by T4X) and Silk'n SensEpil (marked by SS) are the models that will be measured against one another.

Technology and Areas of Use

T4X: A diode laser FDA cleared used on legs, arms, bikini line, underarms, feet, stomach, back, chest, hands, and women's facial hair from the cheek line down.

SS: Uses IPL (intense pulsed light) technology for home hair removal, FDA cleared for permanent hair reduction that requires disposable lamp cartridges. The device is designed to be used on the body (excluding genitals) but can be used on the face from the cheek line down.

Although they can be used on the face, know that laser or IPL may stimulate hidden facial hair to grow in women.

Power and Settings

T4X: Cordless, hand-held rechargeable device with five adjustable power settings.

SS: Corded hand-held device with five adjustable power settings.


T4X: Those with light to medium skin tones (white, ivory, beige, and light brown) and dark hair. White, gray, blond or red hair will not benefit from using the system.

SS: Best candidates are also with light to medium skin tones and dark hair. Shades of brown hair may also respond to the system but typically require more treatments. Red hair may possibly benefit from treatments. White, gray or blond hair doesn't usually respond although the company does mention that some have noted results after multiple treatments.

The devices will target melanin (or color), so that is why dark hair benefits the most because it has the most color to absorb the heat to impair the hair follicle. On the flip side, those with dark skin tones cannot safely use either system because the melanin in the skin can also become attacked resulting in burns, scars, or blistering.


T4X: Built-in skin sensor that checks skin tone and will unlock for use if it's in the right range.

SS: Built-in skin sensor that will pulse light or 'zap' if the skin is within a safe tone range. (This built-in skin sensor feature in only on the Silk'n SensEpil, not the original Silk'n.)

Recommended Treatment Times

T4X: Every week for three months until satisfied with results.

SS: A complete treatment time is considered anywhere between 18-24 months. Every two weeks for the first four sessions and to treat again when hair starts growing back or every four weeks. You go over the area once with no overlapping.


T4X: The feeling is likened to a rubber band snap and some heat. I used the original Tria with three power settings on the highest option for most of my bikini line. It didn't really hurt, but I could definitely feel the snap. As I got deeper into my bikini line there was more discomfort and I did turn the power down a notch. The latest model now has five power settings.

SS: It has been compared to a mild sensation of warmth and tingling. I used Silk'n SensEpil on the highest of the five settings on my legs and underarms. It didn't hurt at all on my legs and wasn't even a tiny bit uncomfortable. My underarms didn't hurt, but every now and then I would feel a snap.

Everyone has their own tolerance to pain/discomfort. You might feel more pain if you have sensitive skin or very dark or thick hair. Not shaving hair completely down right before treatments will make more unnecessary discomfort. The first treatment usually hurts the most, and using the highest setting on either device will also produce more heat, and of course, more likely to give you pain or discomfort.


T4X: The round head of Tria is fairly small (diameter is a little under a 1/2") Each use can take a decent amount of time depending on the area you're working on.

SS: The rectangular head of the system is very large (about 1" x 1 1/4") so treatments are very fast. Both of my entire legs were done in 1/2 an hour and both underarms in less than five minutes.

Ease of Use

T4X: Fits in the hand nicely and is very easy to operate. The cordless feature does allow you to twist and turn the device very easily. But if you're in the middle of a treatment you have to stop and wait for it to re-charge, remembering exactly where you left off.

SS: Cradles in hand and is very easy to use. It's not cordless, but that never seemed to be a hassle or a problem. In fact, using it as long as you need without having to re-charge it is great. Temporary impressions lasting about 30 seconds from the head are made into the skin to let you know exactly where you've hit, so you can easily go to the next section without overlapping. You have to be careful to follow these lines exactly or you could end up missing hair.

Life and Cost

T4X: Retail price of $449 (compare prices on Amazon). Tria Beauty Company points out it's capable of delivering up to 90,000 pulses. When it runs out, you would need to buy another device.

SS: The suggested retail price is $299. See more information on their site for their cartridges and how many shots each has.


T4X: The company claims it, "delivers up to 70% hair count reduction in just two treatments."

SS: The device is FDA cleared for permanent hair reduction. According to the Silk'n hair removal clinical study of 150 females using the hair removal system these were the average hair reduction results after 6 months "41% in the underarms, 54% on the legs, 43% in the bikini area and 52% on the arms."

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