ONDA vs InMode: Double Chin Treatment Comparison

A double chin can make the face look heavier and less defined, and it is not always related to body weight. Genetics, jaw structure, skin laxity and the way fat is distributed all play a role. In Korean dermatology clinics, two non-surgical devices are frequently recommended for fullness under the chin: ONDA, which uses microwave energy, and InMode, which uses radiofrequency-based applicators.

Both aim to reduce submental fat and firm the overlying skin, but they work differently and feel different during and after treatment. This guide compares the two so you can understand what each involves and which might suit your situation.

What causes a double chin?

Fullness under the chin usually comes from one or more of the following: excess fat in the submental area, loose skin and weakened supporting tissue, a recessed chin or jaw that makes the neck angle less defined, and occasionally prominent glands or muscle bands. Energy devices mainly address the first two. If the main cause is bone structure, options such as chin filler or a surgical consultation may be more relevant.

A careful assessment is important because reducing fat when the main issue is loose skin can leave the area looking slack rather than sharper.

How ONDA works for a double chin

ONDA uses microwave energy at 2.45 GHz. The device is designed so that heat concentrates in the subcutaneous fat layer while a cooled surface protects the skin. Fat cells exposed to sufficient heat are damaged and gradually cleared by the body over several weeks. The heat also affects the fibrous connective tissue in the fat layer, which may contribute to firming.

For the face and chin, clinics use smaller handpieces than those designed for the body. Patients usually describe the sensation as a deep warmth. A noticeable reduction in fullness often develops gradually over one to three months.

How InMode works for a double chin

In Korean clinics, InMode double chin treatment usually involves the FX applicator, often in its smaller Mini FX form for the face. It delivers high-voltage RF pulses designed to disrupt fat cell membranes, leading to gradual fat reduction. This is frequently combined with the Forma applicator, which uses bipolar RF with temperature monitoring to heat and firm the skin over the area.

The FX pulses can feel briefly hot or sharp, while Forma usually feels like a comfortable warm massage. As with ONDA, results build over several weeks, and some clinics recommend a series of sessions.

Side-by-side comparison

• Energy: microwave (ONDA) versus RF pulses for fat reduction plus bipolar RF for skin tightening (InMode).
• Fat reduction: both aim to reduce submental fat gradually; the magnitude of change varies between individuals.
• Skin firming: ONDA heats the fat layer and its connective tissue; InMode adds a dedicated tightening step with Forma.
• Comfort: ONDA produces sustained deep warmth; Mini FX produces brief intense pulses; Forma is usually comfortable.
• Swelling and tenderness: both can cause swelling, tenderness or firmness under the chin for several days; some patients notice temporary numbness.
• Sessions: ONDA may be performed once or as a short series; InMode is commonly suggested as a series. Protocols vary between clinics.
• Results onset: gradual for both, typically assessed after one to three months.

Risks and limitations

• Common: redness, swelling, tenderness, a firm or lumpy feeling under the chin and temporary numbness.
• Less common: burns, blistering or persistent nodules, particularly with excessive energy or poor technique.
• Uneven results: fat reduction can occasionally be asymmetric or irregular.
• Over-reduction: removing too much fat in someone with lax skin may make sagging more visible.
• Not suitable or requiring caution: pregnancy, pacemakers or implanted electronic devices, metal implants in the area, active skin infection and certain medical conditions.

Neither treatment helps with weight-related fat elsewhere, and significant weight gain after treatment may reduce the visible benefit.

Which should you choose?

• Moderate fullness under the chin with good skin elasticity: either device may work; a doctor may prefer one based on the size and thickness of the fat pocket.
• Fullness with some loose skin: InMode's combination of fat reduction and Forma tightening is often suggested, or ONDA combined with a separate tightening or lifting treatment.
• Mostly loose skin with little fat: a tightening or lifting device may be more appropriate than fat reduction.
• Very small fat pocket: some doctors may also discuss fat-dissolving injections as an alternative.
• Short jaw or recessed chin: structural treatments may give more definition than fat reduction.

Practical tips for treatment in Korea

Schedule double chin treatment early in your trip, as swelling and tenderness can last several days. Ask the clinic which handpieces and settings will be used, how many sessions they recommend, and how they will judge whether a second session is needed. Remember that the final result will usually appear after you return home, so ask for photographs before treatment for comparison and written aftercare in English. Light massage, if advised by your doctor, and avoiding excessive heat for a few days may help comfort during recovery.

Conclusion

ONDA and InMode both offer non-surgical ways to reduce a double chin, using microwave and radiofrequency energy respectively. ONDA focuses on heating the fat layer, while InMode pairs fat reduction with a separate skin-tightening step. The better option depends on how much of your double chin comes from fat versus loose skin, and a dermatologist's assessment is the best way to determine that.

This article is for general information only and is not a substitute for a medical consultation. Suitability, results and recovery vary from person to person.