A soft double chin is one of the most common reasons visitors ask about non-surgical contouring in Seoul. Here is how InMode Mini FX and ONDA microwave lifting compare, and when other options make more sense.
Both InMode and ONDA can reduce a mild to moderate double chin without surgery. InMode's Mini FX applicator uses radiofrequency to target small fat pockets under the chin, usually over a series of sessions, and Forma can be added to firm the skin. ONDA uses Coolwaves microwave energy absorbed mainly by fat, often delivering more energy per session, with results building over 4–8 weeks. ONDA tends to suit fuller areas; InMode suits smaller pockets and gentle, repeated care. At Dernia Clinic Myeongdong, InMode starts from ₩129,000 per session and ONDA from ₩199,000 (30,000 J), excluding 10% VAT.
Prices are in Korean won, exclude 10% VAT and are confirmed by a doctor at consultation.
What causes a double chin?
A double chin is not always caused by fat alone. It is usually a mix of three things: soft fat under the chin (submental fat), loose skin that has lost firmness, and anatomy, such as a smaller chin, a low-set hyoid bone or posture. Weight changes and genetics play a big role, which is why slim people can still have one.
This matters because each treatment addresses a different part of the problem. Fat-targeting devices like InMode Mini FX and ONDA work best when soft fat is the main cause. If skin laxity or chin shape is the bigger factor, a doctor may suggest another approach, or a combination. See our double chin page and the chin and double chin area guide.
How does InMode Mini FX work?
InMode is a radiofrequency platform with several applicators. Mini FX is designed for small, stubborn fat pockets, such as under the chin and along the jowls. It delivers RF energy to the fat layer to reduce it gradually, and it is usually planned as a series of sessions. Forma is often added to gently heat and firm the skin over the same area, so the contour looks tighter as fat reduces. Each session is relatively quick and comfortable. See the InMode Forma and Mini FX page.
How does ONDA work for a double chin?
ONDA, made by DEKA, uses Coolwaves microwave technology at a frequency absorbed mainly by fat. The handpiece is moved in slow, overlapping passes while it cools the skin surface. Heat in the fat layer can reduce fullness over the following weeks, while heating the surrounding connective tissue can help the area feel firmer. ONDA is priced by total energy in joules; 30,000 J is a typical dose for under the chin or the jawline. See the ONDA Lifting page.
Side-by-side comparison
| Factor | InMode Mini FX (+ Forma) | ONDA Lifting |
|---|---|---|
| Energy | Radiofrequency | Microwave (Coolwaves) |
| Main target | Small fat pockets; Forma firms skin | Fat layer and surrounding connective tissue |
| Best for | Small, defined pockets; gentle regular care | Fuller under-chin areas, padded jowls |
| Sessions | About 3–5, then maintenance | Often 2–3 |
| Session time | Short, per area | 20–40 minutes |
| Downtime | None to mild swelling | Mild swelling or tenderness for a few days |
| Results | Build over the series | Build over 4–8 weeks |
Which is better for double chin reduction?
Both can work well for the right person, so it comes down to the size of the area, your skin quality and your schedule.
- ONDA is often chosen when the under-chin area is fuller, because it can deliver a substantial dose of energy into the fat layer per session. It also suits people who want fewer visits.
- InMode Mini FX is often chosen for smaller, well-defined pockets, and when combined with Forma it addresses skin firmness at the same time. It suits people in Seoul for longer, or who visit regularly and like a comfortable, repeatable treatment.
- Other options may be better in some cases. If the skin is the main issue, a lifting device such as Shurink or Ulthera may help more. For small fat pockets in people who prefer injections, fat-dissolving injections are another option.
Your doctor will feel the area, check how much is fat versus loose skin, and tell you honestly whether a device is likely to make a visible difference. Typical timelines are on the InMode results and ONDA results pages.
Who is a good candidate?
Usually a good fit
- Mild to moderate soft fat under the chin
- Fullness along the jawline or padded jowls
- Stable weight and reasonable skin elasticity
- People who prefer no needles and little downtime
Talk to the doctor first
- A double chin caused mainly by loose skin or chin shape
- Very little fat to treat, where results may be minimal
- Metal implants or implanted electronic devices in the area
- Pregnancy, thyroid concerns, active infection or open wounds
What happens on treatment day
- English consultation. A licensed doctor examines the area, explains whether fat, skin or anatomy is the main cause, and agrees the plan and price with you.
- Marking. The treatment area is marked, keeping clear of sensitive structures.
- Treatment. Mini FX is applied in short cycles to the marked pocket, with Forma glided over the skin if planned. ONDA is applied in slow passes with continuous cooling until the planned energy is delivered.
- Soothing and aftercare. The area is calmed, and you receive written aftercare in English.
Results timeline and recovery
With both treatments, the body clears treated fat gradually, so the change is not instant. Mild swelling in the first days can temporarily make the area look fuller. Most people start to notice a change after about four weeks, with the main result at around two months after their final session. With InMode, the effect builds across the series. Keeping your weight stable helps the result last.
Recovery is usually easy. Expect warmth and redness for a few hours, and possibly swelling, tenderness or a firm, slightly numb feeling under the chin for a few days, sometimes a little longer after ONDA.
Is it safe? Risks and side effects
Both are considered low-risk, non-invasive treatments when performed under medical supervision. Common, temporary effects include redness, swelling, tenderness and numbness in the treated area. Uncommon effects include small firm areas under the skin or prolonged swelling. Rarely, burns, nerve irritation that can briefly affect the smile, or uneven contour can occur, which is why settings and placement should be chosen by a doctor. Contact the clinic promptly if you notice blistering, worsening pain, an uneven smile or numbness that does not improve.
How much do InMode and ONDA cost in Seoul (2026)?
| Treatment | Option | Price (KRW) |
|---|---|---|
| InMode | One area, Forma or Mini FX (e.g. under the chin), per session | ₩129,000 |
| InMode | Forma full face + Mini FX, per session | ₩279,000 |
| ONDA | 30,000 J, under the chin or jawline | ₩199,000 |
| ONDA | 60,000 J, lower face, jawline and under the chin | ₩349,000 |
Prices exclude 10% VAT. InMode is usually planned as a series, so compare the total plan. The tourist VAT refund on cosmetic procedures ended on January 1, 2026. See InMode price and ONDA price.
Planning double chin treatment around your Seoul trip
- Book ahead. Send your dates and a side-profile photo via the consultation form so a doctor can suggest a plan.
- Avoid your arrival day. Schedule treatment for day two or later.
- Series on a short trip. ONDA may fit one or two visits; InMode works best if you can return for further sessions.
- Getting here. Dernia is near Myeongdong Station (Line 4) and Euljiro 1-ga Station (Line 2).
Flying home? Neither treatment leaves wounds, so most people can fly the next day. Swelling under the chin may last a few days; avoid saunas, alcohol and intense workouts for a day or two. See our aftercare guide.
Frequently asked questions
Which is better for a double chin, InMode or ONDA?
ONDA is often chosen for fuller areas because of the energy it can deliver per session, while InMode Mini FX suits smaller pockets and repeated sessions. A doctor decides after examining you.
How many sessions will I need?
InMode is usually planned as three to five sessions. ONDA often needs two or three sessions several weeks apart.
When will I see results?
Most people notice a change after about four weeks, with the main result around two months after the final session.
Is the fat reduction permanent?
Treated fat cells are cleared by the body, but remaining fat can grow with weight gain, so keeping your weight stable matters.
How much do they cost at Dernia?
InMode starts from ₩129,000 per session for one area and ONDA from ₩199,000 for 30,000 J, excluding 10% VAT.
Are there alternatives?
Yes. Fat-dissolving injections, lifting devices or a combination may suit some people better. Your doctor will explain the options.
Want a sharper jawline in Seoul?
Tell us your concerns and travel dates. A doctor will examine your chin and jawline, explain the options in English and confirm your plan and price before treatment.
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This article is for general information and does not replace a medical consultation. Results vary between individuals, and suitability, treatment plan and final price are confirmed by a licensed doctor after an in-person examination. Dernia Clinic Myeongdong does not publish patient testimonials or before-and-after claims.