Home · XERF for Smile Lines, Jowls and Sagging: What
Smile Lines, Jowls and Sagging Skin: Where Energy-Based Tightening Fits, and Where It Does Not
Three concerns, three different mechanisms. Matching the treatment to the mechanism is what separates a satisfying result from a disappointing one.
Short answer. Smile lines, jowls and general sagging look related and are not. Smile lines are folds created by volume and movement; jowls form from skin laxity, fat, ligament change and bone loss together; sagging is a mix of all of these plus loss of support from above. Radiofrequency tightening addresses the skin and soft-tissue laxity component. It will not fill a fold, remove a fat pad or rebuild a jaw, and treating the wrong component is the most common reason patients are disappointed.
Three concerns that look related and are not
| Concern | What is actually happening | Where tightening fits |
|---|---|---|
| Smile lines (nasolabial folds) | A fold where the cheek meets the lip, deepened by midface volume loss, descent and repeated movement | Limited. Tightening may soften the upper cheek that overhangs the fold; it does not erase the fold |
| Jowls | Multifactorial (Talei 2024): lengthening connective tissue around the mandibular ligament (Minelli 2023), fat compartment change (Rohrich & Pessa 2007) and mandibular bone loss (Shaw 2010) | Good, when laxity is the main driver and the change is early to moderate |
| Sagging / laxity | Skin elasticity, soft-tissue support and volume, changing together | Reasonable for mild-to-moderate laxity; poor for heavy skin excess |
Skin laxity is not volume loss
Laxity is a support problem: tissue that no longer holds its position. Volume loss is a quantity problem: there is less fat and bone than there used to be. Tightening a skin envelope over a shrinking frame does not rebuild the frame, and adding volume to a face that is mainly lax can make it heavier. Distinguishing the two is most of the consultation.
Why not every smile line should be filled
A deep nasolabial fold is often a downstream sign of midface change rather than a local problem. Treating the midface — with volume where it is genuinely missing, or with tightening where the tissue has descended — frequently softens the fold more naturally than injecting into it. Filling the fold itself, repeatedly, is how faces begin to look treated.
What a dermatologist assesses first
- How much skin moves when it is gently lifted, and how quickly it returns.
- How much fat sits in front of and below the jaw.
- Whether the chin and jaw angle still provide support.
- Whether the midface has lost volume.
- How the two sides differ — and they almost always do.
- What has already been done: filler, toxin, boosters, threads, HIFU, liposuction, and when.
The assessment is done sitting upright, because lying flat flatters every jawline. When the dominant problem turns out to be fat or bone rather than laxity, we say so, and XERF is either combined with something else or not used at all.
What XERF can realistically improve
Firmness and definition where laxity is mild to moderate, developing over roughly three to six months (O’Connor 2021). Published reviews describe mild-to-moderate improvement, with higher satisfaction among patients seeking modest change (Austin 2021). A 2026 multicentre study of dual-frequency monopolar RF reported clinician-rated improvement in most of its 39 participants at 90 days, without a control group (Cureus 2026).
We describe this as tightening, an improvement in the appearance of laxity, or support for a more defined contour. We do not describe it as lifting facial structure, because that is not what the evidence shows.
What XERF cannot correct
- A significant fat pad beneath the chin or jaw.
- Volume loss in the midface, tear trough or temple.
- Bone-related change along the jaw and chin.
- Platysmal bands, which are muscle — see the neck.
- Heavy skin excess, where surgery gives a result no device matches.
- Static lines etched into thin, sun-damaged skin, which are a skin-quality problem — see laxity versus skin quality.
When another modality is the better answer
Filler for structural support along the jaw or chin. Botulinum toxin for muscle-driven change. Skin boosters or resurfacing for quality and texture. Focused ultrasound as an alternative energy device — in the one randomised split-face comparison, monopolar RF and microfocused ultrasound performed similarly (Alhaddad 2019). Surgery when laxity is advanced. Often the honest answer is a sequence, not a single treatment.
Why vectors and regional planning matter
Tissue is not uniform, so energy should not be either. A plan allocates depth and pulses by region — deeper along the jawline and under the chin, mid-depth across the midface, lighter on the neck — and adjusts for asymmetry, previous treatments and avoidance zones. In modelling and animal work, the two frequencies deposit heat differently, which is the rationale for varying depth rather than treating a whole face at one setting (Ko 2025).
Why results differ between patients
Degree of laxity, skin thickness, sun damage, smoking, the anatomy behind the concern, and the total energy delivered. Under-dosing is a common reason radiofrequency appears to do nothing. And objective change and satisfaction are not the same: in one early study most treated areas improved photographically while only half the patients said they were satisfied (Fitzpatrick 2003).
Who should not have XERF
Not treated: anyone with a pacemaker, an implantable defibrillator or another implanted electrical device — monopolar radiofrequency passes current through tissue and can interfere with them. Pregnancy.
Assessed carefully first: metal implants or permanent filler in the treatment area; active skin infection or inflammatory skin disease at the site; a history of keloid scarring; isotretinoin within the past six months; current or recent malignancy; poorly controlled diabetes.
Probably better served by something else: heavy skin excess, where a surgical result is more meaningful than a tightening treatment. The full list sits on the XERF safety section.
Not sure which of the three you have?
Send a front and side photo in natural light. You will get an anatomical answer, not a package.
Ask dr. Jesslyn on WhatsAppCompare the options: skin tightening at Elea · what is realistic without surgery
Sources
- Talei 2024; Minelli 2023; Rohrich & Pessa 2007; Shaw 2010 — anatomy of the ageing lower face.
- O’Connor 2021; Austin 2021; Fitzpatrick 2003 — expected magnitude, selection and satisfaction.
- Cureus 2026 — dual-frequency monopolar RF, 39 participants, 90 days, no control group.
- Alhaddad 2019 — randomised split-face comparison of monopolar RF and microfocused ultrasound.
- Ko 2025 — depth of heating at 6.78 and 2 MHz (modelling and animal work).
Questions we are asked
Can XERF remove smile lines?
No. A nasolabial fold is created by volume and movement. Tightening may soften the cheek tissue above the fold, but it does not erase it, and repeatedly filling the fold itself is rarely the best plan.
Is XERF good for jowls?
For early-to-moderate jowling driven by skin and soft-tissue laxity, yes. Where fat volume or bone change dominates, no.
Will XERF lift my face?
It can tighten and improve the appearance of laxity. It does not reproduce a surgical lift, and we avoid the word “lift” for that reason.
XERF or filler for nasolabial folds?
They address different problems and are sometimes sequenced. An assessment decides which is dominant in your face.
How many sessions for the jawline?
Usually one, reviewed at about three months.
When is surgery the better option?
When skin excess is heavy. A device cannot remove skin, and it is fairer to say so than to sell a series of treatments that will disappoint.
Medically reviewed by dr. Jesslyn Amelia, Sp.D.V.E — Dokter Spesialis Dermatologi, Venereologi dan Estetika. Registered with the Indonesian Ministry of Health, STR JT00000382760637. Verify registration. Last reviewed 24 September 2026. Individual results vary; this page is general information and not a substitute for consultation.