What is XERF, and what can it change?
XERF is a non-surgical skin-tightening treatment using dual-frequency monopolar radiofrequency (RF) from Cynosure Lutronic. A handpiece delivers energy through the skin surface to heat tissue and encourage collagen remodelling, without needles or incisions.
It may be worth considering for mild to moderate looseness around the cheeks, lower face and jawline. The aim is a gradual improvement in firmness and contour. It cannot remove excess skin, replace lost facial volume or reproduce a surgical facelift.
Smooth Clinic’s published XERF prices start at 29,900 THB for 300 shots. Choosing a treatment should begin with the cause of your concern and the change you want, rather than the largest package or the newest device.
How the two RF frequencies work
XERF uses 6.78 MHz and 2 MHz RF. Tissue resistance converts electrical energy into heat; carefully controlled heating can affect existing collagen and stimulate subsequent remodelling. In dual-frequency delivery, the two frequencies are applied sequentially within a treatment shot.
Computational modelling and a small animal study found that 2 MHz could produce broader, deeper heating than 6.78 MHz under the conditions tested. This supports the design concept, but does not establish one fixed depth for each frequency or prove an equal effect in every layer of a human face. Tissue thickness and anatomy matter.
The manufacturer calls its approach “Structural Skin Tightening” and incorporates surface cooling, feedback and energy controls. These features help manage treatment delivery; they do not guarantee a painless treatment, prevent every burn or establish superiority over single-frequency RF. Claims about deep supporting tissue, including the SMAS layer, should not be read as evidence of a facelift-like result.
How strong is the evidence for XERF?
Early human studies report improvements in facial laxity and patient satisfaction. A 2026 prospective study had 39 completers across four sites, all treated twice, with assessments 30 and 90 days after the final session. It had no control group or blinded independent assessment. The manufacturer supplied equipment, consumables, a research grant and data or statistical support.
A separate 2026 retrospective study followed 16 adult women after one treatment, with formal follow-up through three months. It also lacked a control group; the manufacturer provided administrative and statistical support, and one author disclosed a trainer relationship.
These are encouraging short-term findings, but small studies cannot establish rare-complication rates, a reliable long-term lifespan for results or which device is best. They support a discussion about realistic improvement, rather than a guaranteed percentage of lifting.
Who may benefit, and when might another approach fit better?
XERF may suit someone with early or moderate skin laxity who wants a subtle change and accepts that results develop gradually. There is no single age at which everyone needs it. The degree of looseness, facial volume, skin condition and expectations are more useful than age alone.
A softer jawline can come from loose skin, fat, lost structural support or a combination. Pronounced sagging, substantial excess skin or hollow cheeks may need a different discussion. A naturally slim face deserves particular attention to preserving volume.
XERF should not be sold as a weight-loss treatment or a guaranteed way to dissolve a double chin. A tighter-looking contour is not proof that fat cells have been destroyed. If excess fat or lost volume is the main issue, ask what the proposed treatment can realistically address.
Which areas can be assessed for treatment?
The treatment area must be selected after examining the skin and underlying anatomy. A facial treatment package does not automatically include the neck, eyelids or every area shown in a promotional diagram.
| Area or concern | What to discuss | Important limit |
|---|---|---|
| Cheeks and lower face | Skin looseness and the definition of the lower face | Tightening does not replace volume in hollow areas. |
| Jawline and under the chin | Whether lax skin contributes to the contour concern | A fat bulge and loose skin require different assessment. |
| Neck | Skin quality, laxity and whether this area is included | Deep folds or marked excess skin may respond less than expected. |
| Eye area or body | Whether treatment is appropriate with the specific device, tip and approved use | Do not assume these areas are available or included at Smooth Clinic. |
How many XERF shots do you need?
A “shot” is a unit of device energy delivery, not an injection. There is no universal count for a face, jawline or neck. The amount of skin being treated, anatomy, chosen tip and treatment goals all affect planning.
The 300-, 600- and 900-shot options below are published packages, not a treatment map. Ask which areas the proposed count covers and why that plan fits your concern. More shots do not automatically mean a better result, and shot counts should not be compared directly across different devices.
XERF prices at Smooth Clinic
The clinic’s official price page (Thai) lists the following XERF options, checked on 15 October 2026, Thailand time. Prices are in Thai baht (THB).
| Programme | Published quantity | Published price |
|---|---|---|
| XERF | 300 shots | 29,900 THB |
| XERF | 600 shots | 49,990 THB |
| XERF | 900 shots | 72,990 THB |
The price card does not specify treatment areas, doctor or follow-up fees, other inclusions or an expiry date. Before paying, confirm the total for your individual plan, what is included, whether any further sessions are proposed, and the clinic’s deposit and cancellation terms.
A useful value comparison considers the likely degree of improvement, safety, follow-up and overall cost. A cheaper shot or a larger bundle is poor value if it does not address the main cause of your concern.
XERF, Oligio X, Thermage or ultrasound lifting?
The most useful distinction is how the devices deliver energy and whether that approach fits your anatomy. The number of frequencies alone does not tell you which will work best.
| Treatment | Main technology | Decision to discuss |
|---|---|---|
| XERF | Monopolar RF using 6.78 MHz and 2 MHz | Whether gradual tightening fits your concern and the limits of its emerging clinical evidence |
| Oligio X | A different monopolar RF platform with its own energy-delivery and cooling system | The proposed areas, comfort plan and total cost, without assuming all RF devices are interchangeable |
| Thermage FLX | Single-frequency monopolar RF | Suitability and evidence for the particular concern, rather than assuming two frequencies must be better |
| Ultherapy PRIME | Microfocused ultrasound with real-time imaging | Whether focused ultrasound is appropriate for the tissue being assessed |
| Ultraformer III | Micro- and macro-focused ultrasound | The exact model and intended treatment; it is not interchangeable with Ultherapy or other Ultraformer models |
If lost volume is the main concern, dermal fillers have a different role from an energy-based tightening treatment. They also carry separate risks, including rare but serious blood-vessel blockage, so adding an injectable is a separate medical decision.
For substantial sagging or excess skin, a surgical consultation may offer a more relevant comparison. Surgery can produce a greater structural change, with recovery and surgical risks to consider. It is also reasonable to defer treatment if the likely improvement does not justify the cost for you.
When will results appear, and how long will they last?
An early feeling of tightness is not the final result: temporary swelling and the immediate thermal effect can influence what you see. Compare photographs taken with similar lighting, expression and head position over the following weeks and months.
The clinical studies above assessed improvement over roughly one to three months after treatment. They do not establish that everyone’s result will last one or two years. Longer-term durability remains uncertain, and skin ageing continues.
Agree on a review point and a realistic goal before treatment. The important question is whether the change is meaningful for your original concern, not whether your photograph matches someone else’s result.
Will you need another session or maintenance?
A repeat visit is not automatically a repeat treatment. One session may be followed by reassessment, while some people may be offered a course; the plan should explain the reason for each additional session and its cost. A study’s schedule is not a prescription for every patient.
There is no established universal XERF maintenance interval. Review the benefit already achieved and whether laxity has returned before deciding to repeat treatment. If improvement is limited, reassess the cause of the concern rather than immediately buying more shots.
Does XERF hurt, and is numbing necessary?
You may feel warmth, bursts of heat or discomfort. Cooling can improve comfort, but “no numbing” should not be understood as “no pain.” The multicentre study reported average pain of 4.2 out of 10 without anaesthesia; this is not a prediction of your experience or a fair head-to-head comparison with another device.
Discuss pain concerns and appropriate comfort measures beforehand. Do not self-medicate to tolerate treatment. Tell the treating clinician immediately about sharp pain, a concentrated burning sensation or anything that feels abnormal; enduring more pain does not ensure a better result.
Who should postpone treatment or needs additional screening?
Postpone elective cosmetic treatment during pregnancy. Safety information during breastfeeding is limited, so discuss this before booking. Postpone treatment over active infection, open wounds, significant inflammation or sunburn until the area has been assessed and treated.
RF may be unsuitable for people with pacemakers, implanted defibrillators or other electronic implants. Metal implants also need specific assessment. Do not assume a routine facial appointment is safe without checking the device’s contraindications and your medical circumstances.
Tell the clinician about medical conditions, altered skin sensation, healing problems, medicines, implants and previous facial procedures. Include the product and date if you have had fillers, threads, surgery, lasers or another tightening treatment. Do not stop prescribed medication on your own.
Preparing for your appointment
Avoid arriving with irritated or sunburned skin. If you have recently had another procedure in the same area, ask when an assessment is appropriate; the interval depends on what was done and how your skin has recovered.
A consultation should establish whether the main issue is skin laxity, fat or lost volume, then cover expected improvement, alternatives, risks, areas and the written price. Consistent baseline photographs can make later assessment more useful.
In general, treatment involves cleansing the area, preparing the equipment according to its instructions and applying the handpiece to the agreed skin areas. Afterwards, the skin should be checked and aftercare explained. This is a general outline, not a fixed Smooth Clinic appointment protocol; confirm the full visit length, including consultation, when booking.
Recovery, skincare and planning around work or travel
Because there are no needles or incisions, many people can resume daily activities promptly. Redness, warmth, swelling or tenderness can still be visible or uncomfortable. Leave flexibility around an important event or photoshoot rather than relying on a promise of no downtime.
Use gentle cleansing and moisturising products, protect your skin from the sun and avoid rubbing or irritating products while it is sensitive. If heat aggravates redness or discomfort, avoid very hot showers, saunas and strenuous activity until your skin settles and follow your clinician’s advice.
Makeup and exercise depend on the condition of the skin, not an automatic same-day rule. If you are travelling soon, agree how to obtain a review and whom to contact before leaving Bangkok. Worsening symptoms should be assessed promptly rather than waiting for a routine follow-up.
Side effects and serious risks to understand
Temporary redness, swelling, warmth, tightness or tenderness can occur. Small XERF studies cannot rule out uncommon or delayed complications. Thermal RF procedures can cause blisters, burns, pigment changes and scarring; cooling does not eliminate these risks. General RF safety information does not establish the complication rate for XERF specifically.
Could XERF cause hollowing, fat loss or nerve problems?
There is not enough evidence to guarantee that unwanted volume loss can never happen. The small retrospective study did not observe fat atrophy during its follow-up, which is not proof of zero risk. Discuss existing hollowness and any concern about losing facial volume before selecting an area.
The U.S. FDA’s 2025 warning about burns, fat loss and nerve injury concerned RF microneedling, which delivers energy through needles. XERF uses a surface-contact applicator. That warning should not be presented as XERF-specific incidence data, nor should the difference be used to promise that XERF is risk-free.
Seek prompt medical assessment for increasing pain or burning, blisters, unusual pale or dark skin, wounds, new numbness or weakness, or an unexpected contour change. Visual symptoms or severe symptoms need urgent care, not a wait until the next appointment.
Authenticity, regulatory status and the specific tip recall
Ask how the provider verifies the source of the device and its compatible treatment tips, follows the manufacturer’s instructions and checks applicable Thai medical-device documentation. A US regulatory record does not replace verification of the product used in Thailand.
XERF’s US FDA 510(k) clearance, K251327, dated 11 August 2025, lists electrocoagulation and haemostasis in dermatological and general surgical procedures. It is not a blanket endorsement of every cosmetic claim or a guarantee of safety.
A 2025 recall covers certain models and lots of XERF EFFECTOR 60 tips because of manufacturing defects; Thailand is included in the distribution list. This does not mean every XERF device was recalled. It is a reason to verify tip sourcing and lot status with the provider before treatment. The public record does not establish whether Smooth Clinic has any affected tips.
Choosing a provider and reading XERF reviews
Look for a consultation that explains what can realistically improve, who will treat you, how suitability is assessed and what happens if a problem arises. Review Smooth Clinic’s doctor profiles and confirm the treating doctor’s identity when booking; a profile does not establish who is available for your appointment.
You can view Smooth Clinic’s XERF before-and-after gallery. The image labels are in Thai, and some identify a one-month comparison. These are examples of individual outcomes, not a prediction of your result or evidence of long-term durability.
Compare lighting, facial expression and camera angle, and ask whether other treatments were performed. A photo alone does not establish the number of shots, the complete treatment history or the reason one person improved more than another.
Booking XERF in Bangkok
Smooth Clinic is on the second floor of Times Square Building, 246 Sukhumvit Road, near BTS Asok and MRT Sukhumvit. Use the clinic’s contact and location page, call 088-121-8888 or message LINE OA @smoothclinic to enquire about an assessment.
Tell the clinic which area concerns you, your preferred date and any upcoming event or travel. If you need consultation, consent or aftercare in English, confirm that these arrangements are available before booking.
Other questions before deciding
Can I have XERF with braces, dental implants or facial metal?
Tell the clinician exactly what you have and where it is. Suitability depends on the implant, location, treatment area and device instructions. Dental work is relevant to screening, but neither blanket reassurance nor treating all metal as identical is appropriate.
What if I have already had fillers or threads?
The clinician needs to know the product, location, date and any previous reaction. Some combinations may be considered, but there is no single waiting period that fits every material or procedure. Permanent fillers and implants deserve particular attention.
Is combining XERF with Ultherapy or another device better?
A combination may make sense when each treatment has a distinct purpose. It also adds cost and tissue exposure. Ask what each component is intended to improve and why the proposed sequence is appropriate; a multi-device package is not automatically more effective than a single treatment.
Sources and further reading
- Cynosure Lutronic: XERF technology. Manufacturer information on device design, not independent proof of superiority.
- Ko and colleagues (2025): computational modelling and histological analysis of 6.78- and 2-MHz monopolar RF. Preclinical evidence.
- Weiss and colleagues (2026): prospective multicentre study of facial laxity and lower-face lifting.
- Erlich and colleagues (2026): retrospective evaluation of XERF.
- American Academy of Dermatology: options for firming sagging skin.
- FDA: non-invasive body-contouring technologies, including RF precautions and risks. Device-class safety information, not XERF-specific facial outcome data.
- FDA: RF microneedling safety communication. Applies to needle-based RF and is discussed here to distinguish the technologies.
- WONTECH: Oligio X; Thermage: Thermage FLX; Ultherapy: ultrasound with imaging; CLASSYS: Ultraformer III product information.
- FDA: dermal fillers, uses and risks.