Youth · Focused Ultrasound
Ultline: Five Depths, Face and Body
Focused ultrasound with five cartridge depths, approved for both facial lifting and abdominal fat reduction. Which depths your plan uses is the whole decision.
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Quick Answer
What does Ultline actually do?
It delivers focused ultrasound at whichever depths your assessment calls for — from fine lines at 1.5mm to the SMAS at 4.5mm, and the abdomen at 13mm.
In Brief
Focused ultrasound at five depths, for face and body.
Ultline is a fifth-generation HIFU device holding Korean MFDS approval for two uses: facial lifting and abdominal fat reduction. Onlif offers both. It delivers focused ultrasound to a chosen depth, forming thermal points at 65-80°C that prompt your own collagen to rebuild. It tightens and reduces; it does not add volume, and if a hollow is what bothers you this is the wrong treatment.
Pillar
Youth
Type
Focused ultrasound (HIFU)
Approved use
Facial lifting & abdominal fat reduction
Depth control
Five cartridge depths
Sessions
At least three, 4 weeks apart
Downtime
Non-invasive
Often paired with
Ultherapy · Shurink Universe · Liftera
Understanding It
What Focused Ultrasound Does at Depth
Ultline delivers focused ultrasound energy to a set depth beneath the skin, where it produces small, evenly spaced thermal points. The surface is left undisturbed. The energy converges below it, the way light converges through a lens. Each of those points is a controlled injury, and the skin’s response to it is to lay down new collagen over the following weeks.
What makes the device useful is depth control rather than raw power. Five cartridges cover different depths, and the doctor selects by what is happening in your tissue rather than running everything at one setting. Two of those depths reduce fat, which is why the selection matters: the same device can slim a heavy jawline or hollow a thin face.
Results arrive gradually. Collagen remodelling is a process of weeks to months, not an effect you see leaving the clinic, and the manufacturer’s own guidance is a course of at least three sessions spaced over time, not a single visit.
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The Device
Ultline
Technology HIFU, fifth generation multi-depth
Cartridges 1.5, 2.0, 3.0 and 4.5mm for the face; 13.0mm for the body
Coagulation 65-80°C at the target depth
Delivery dot and line patterns
Cooling patented surface cooling system
Course at least 3 sessions, 4 weeks apart
Approval MFDS, for facial lifting and abdominal fat reduction
We use the genuine manufacturer handpiece and consumables. You are welcome to ask to see them before treatment.
Honest Scope
What It Treats — and What It Doesn’t
Ultline holds Korean MFDS approval for two things: facial lifting and abdominal circumference reduction. Onlif offers both. The facial cartridges run from 1.5mm to 4.5mm; the body cartridge works at 13mm on the abdomen and flanks.
Depth is worth being precise about, because the face holds several different problems. Slack skin and fine lines sit shallow, at 1.5 to 2mm. Heavy buccal fat and jowls sit at 3mm. A jawline lost to descent sits at the SMAS, 4.5mm. Treating the wrong depth produces a session that was never going to work.
Hollowness is lost volume, and no amount of tightening replaces volume — that belongs to the Balance pillar. We would rather tell you which problem you actually have than treat the one we happen to have a device for.
Candidacy
Who It May Be For
It tends to suit people noticing that the jawline has softened, that the lower face feels heavier than it did, or that fine lines and slack pores have arrived together. Those are descent and laxity rather than lost volume, and they respond to support.
It suits less well where there is significant skin excess, where the concern is genuinely under the eye, or where the change you want is larger than a non-surgical device can deliver. Onlif is a non-surgical clinic, and where surgery is the better answer we’ll say so at consultation, not after a course.
Your doctor assesses the whole face rather than the area that bothers you most, because descent rarely happens in one place and treating it in isolation is how results come out uneven.
The Visit
What to Expect
The area is assessed and mapped first, then treated cartridge by cartridge at the depths chosen for your tissue. A two-stage cooling mode protects the surface of the skin throughout.
Sensation varies by area and by cartridge. Most people describe brief warmth or a prickling at each point, and the energy level can be adjusted for comfort as the session goes on. Where discomfort lingers afterwards it usually settles within a few days, and anything persisting beyond that should be raised with your doctor.
It is non-invasive, so there’s no recovery period to plan around. You can return to an ordinary day immediately, which is much of why it suits people visiting Seoul on a short trip.
Honest Alternatives
If Something Else Fits Better
Youth
CoolSoniq
Focused ultrasound with a cooled tip, where comfort is the deciding factor.
The Depths
Five Depths, Face and Body
Skin thickness and the degree of sagging differ from person to person. Which depths are used is the whole plan.
| Depth | Layer reached | Typically used for |
|---|---|---|
| 1.5mm | Superficial dermis | Fine lines around the eyes, slack pores |
| 2.0mm | Subcutaneous tissue | Texture, collagen regeneration |
| 3.0mm | Subcutaneous fat, upper SMAS | Heavy buccal fat, jowls |
| 4.5mm | SMAS | Jawline contour, deep support |
| 13.0mm | Deep subcutaneous fat — body only | Abdomen and flanks |
The 3.0mm and 13.0mm cartridges reduce fat. On a thin face the 3.0mm is used sparingly or not at all, and your doctor should say which depths your plan uses and why.
Key Points
What to Take Away
- Focused ultrasound with five cartridge depths, approved for face and body.
- 1.5mm fine lines and pores. 2.0mm texture. 3.0mm buccal fat and jowls. 4.5mm the SMAS.
- 13mm is body only — abdomen and flanks.
- Thermal points at 65-80°C, the range that contracts tissue.
- Patented cooling. Most describe tingling rather than pain.
- Dot and line delivery, so broad and detailed areas in one session.
- No bruising or bleeding. Redness settles in hours.
- At least three sessions, four weeks apart.
- The 3.0mm reduces fat, so it is used sparingly on a thin face.
FAQ
Questions People Ask
Sensation varies with the area treated and the cartridge used. Levels are adjusted to what you can comfortably tolerate, and a two-stage cooling mode protects the skin surface. Any discomfort afterwards generally settles within a few days.
It depends on your starting point, but a periodic course of at least three is the general guidance, not a single treatment. Your plan will give you a realistic number after assessment.
It is a non-invasive treatment and ordinary daily life continues immediately. Specific aftercare is given at your appointment.
Not directly. Hollowness is lost volume and tightening does not replace it. If that’s your main concern we will assess whether what you are seeing is shadow, pigment or vasculature, and point you to the right treatment instead.
Both use focused ultrasound, but they are different devices with different depth ranges and different approved uses. Which one suits you is an assessment decision, not a preference.
Collagen change is gradual, building over weeks to months after treatment, not appearing immediately.
Begin With Your Face, Not a Menu
A consultation establishes what is actually happening around your eyes (descent, volume or movement) before anything is recommended.