
2026-07-22 • Patient Resources & Tips
Welcome to Seye clinic, dedicated to all facets of beauty.
"Doctor, for someone whose skin is just starting to sag like mine, which lasts longer—XERF or Density?"
This is, in fact, the most frequently asked question during recent lifting consultations. Although both devices are known for relatively painless RF (radiofrequency) tightening, there are notable differences in how the energy works, cost, and the nature of the changes they provide—which can lead to some confusion. Today, our chief doctor will clarify the main differences between these two tightening devices.
Both devices use radiofrequency energy to heat collagen tissues, but approach the goal differently. To illustrate, XERF feels like two different massagers working from the superficial layers down to the deeper fat layer, whereas Density utilizes a method that alternates monopolar and bipolar RF energy sequentially within a single shot. XERF uses dual frequencies of 6.78MHz and 2MHz simultaneously to precisely distribute staged energy targeting the dermis and fat layers individually, whereas Density alternates monopolar and bipolar modes sequentially within a single shot, making it relatively less refined in layer-specific precision. Manufactured by LUTRONIC, XERF tightens the skin immediately after treatment while minimizing discomfort with a three-step cooling system that protects the surface. Additionally, XERF has the advantage of improving skin elasticity while also refining facial contours, including the double chin and sagging jawline.

Many patients hesitate when choosing between them. We recommend XERF for those looking to address fine lines, elasticity, and facial contouring at the same time, while Density is more suitable for individuals wanting a noticeable line improvement.
XERF | Density | |
|---|---|---|
Main Indications | Fine lines, pores, elasticity, contour (double chin) | Sagging lines, tightening |
Recommended for | Sensitive to pain, quick return to daily life | Priorities tightening effect |
Pain Level | Very minimal | Mild |
Recovery | Immediate return to daily activity | Immediate return to daily activity |
In brief, patients with sensitive skin, those who are pain-sensitive, or need to return to daily life immediately often choose XERF, whereas those seeking stronger improvement in lines and firmness tend to select Density.

Duration of results varies significantly from person to person for both devices, so it is best to receive personalized guidance through consultation. XERF provides a comparatively gentle experience thanks to its cooling and minimal-pain design, while Density delivers an expected tightening effect after the procedure.
XERF | Density | |
|---|---|---|
Method | Dual RF (6.78, 2MHz), simultaneous staged delivery | Monopolar+Bipolar crossed RF |
Pain Level | Very minimal | Mild |
Downtime | Almost none | Almost none |
Price | Varies by package | Varies by package |
Longevity | Varies by individual | Varies by individual |
Change Feel | Ongoing tightening sensation | Expect tightening |
Accordingly, XERF offers a smoother procedure with less surface irritation, and both options allow patients to return to daily activities immediately after treatment.
Q. Can I wear makeup and resume daily activities immediately after both treatments?
Yes, both RF procedures allow facial washing and makeup on the same day without special downtime. In rare cases, some temporary redness may occur but will usually subside quickly.
Q. Is the pain truly minimal? Will numbing cream alone be enough?
Yes, XERF protects the surface with a cooling system and most people are comfortable with just numbing cream. Density also tends to cause only mild discomfort.
Q. What's the difference between the 300-shot and 600-shot packages?
The 300-shot package covers specific areas, while the 600-shot option includes the full face and contours, addressing wider areas. Partial treatments may have slightly shorter duration.
Q. How often should the procedure be repeated?
Longevity depends on individual skin characteristics; an in-person consultation is recommended for guidance.
At Seye clinic, we do not perform lifting based on experience alone. With the EVE LAB precision diagnostic system and 3D facial analysis, we accurately assess each patient’s skin thickness, asymmetry, and fat layer location. Dual RF energy from XERF is then custom-distributed, taking into account ligaments and fat structures. Our KOL (Key Opinion Leader) physicians directly conduct 1:1 consultations and design, and when necessary, we offer hospital-level monitored sedation for your peace of mind.
Ultimately, when it comes to RF tightening, it is important to carefully compare the principles, pain levels, and options of XERF and Density to find the best fit for your face and concerns. If you are curious about the most suitable option for your individual needs, we recommend visiting for an in-person consultation. This has been the chief doctor at Seye clinic—thank you for reading.
*This content is for informational purposes only and does not substitute for medical diagnosis. As results may vary by individual, please consult with qualified medical professionals before undergoing any aesthetic procedures.
Ready to experience the difference? Book a free consultation via WhatsApp (+82-10-3110-9806) or browse our current events and packages. Our English-speaking team is ready to help you plan your visit.
Seye Clinic
10F, 55 Seocho-daero 77-gil, Seocho-gu, Seoul
• Parking available (1h free with treatment)
Phone: +82-507-1345-5928
Email: info@seyeclinic.com
Opening Hours: Weekdays/Evening Clinic 10:30-21:00 (reservation cutoff 19:00), Weekends/Public Holidays 10:30-19:00 (reservation cutoff 17:00)
Copyright © 2026 SEYE CLINIC. All Rights Reserved.
Seye Clinic
10F, 55 Seocho-daero 77-gil, Seocho-gu, Seoul
• Parking available (1h free with treatment)
Representative: Eun Sol Lee
Privacy Officer: Eun Sol Lee
Business Registration Number: 470-03-03420
Phone: +82-507-1345-5928
Email: info@seyeclinic.com
Opening Hours: Weekdays/Evening Clinic 10:30-21:00 (reservation cutoff 19:00), Weekends/Public Holidays 10:30-19:00 (reservation cutoff 17:00)
Copyright © 2026 SEYE CLINIC. All Rights Reserved.