How Thermage Flx Works
Thermage Flx delivers monopolar radiofrequency energy through a treatment tip that contacts the skin surface. Each pulse sends capacitive coupling energy to depths of 2.4-4.3mm, heating the collagen-rich dermal and subdermal layers while a cryogen spray protects the epidermis. The device operates at a frequency of 6.78 MHz, generating volumetric heating that causes immediate collagen fiber contraction followed by long-term neocollagenesis over 3-6 months.
The 4th-generation AccuREP (Accela, Repeat, Pulse) technology distinguishes Thermage Flx from earlier versions. AccuREP automatically measures tissue impedance before each pulse and adjusts energy delivery in real time, ensuring uniform heating across different facial zones. This calibration occurs within milliseconds, allowing the device to optimize energy for thinner periorbital skin and thicker jawline tissue within the same session without manual adjustment.
What Thermage Flx Treats
Face and Jawline
A 600-shot full-face Thermage Flx protocol addresses skin laxity across the forehead, cheeks, jawline, and submental region. Clinical studies report measurable tissue tightening in 87% of patients at the 6-month mark. The treatment reduces jowl volume, defines the jawline contour, and lifts mid-face tissue by stimulating collagen at the deep dermal junction. Periorbital treatments using the specialized 0.25cm2 tip target crow's feet and upper eyelid hooding with 200-400 additional shots.
Neck and Body
Thermage Flx extends beyond facial applications. Neck treatments using 300-400 shots address horizontal necklines and crepey texture. Body applications with the 3.0cm2 tip treat areas including the abdomen, arms, thighs, and knees with 400-600 shots per zone. The larger tip covers more surface area per pulse, making body treatments efficient despite larger target zones.
The Thermage Flx Treatment Experience
A standard 600-shot full-face session takes 45-60 minutes from start to finish. No topical anesthesia or numbing cream is required because the integrated vibration and cooling systems manage discomfort during each pulse. Patients describe the sensation as alternating warm and cool phases, with comfort levels averaging 3-4 on a 10-point scale. The practitioner applies a coupling fluid and grid-stamped transfer paper to map treatment zones, ensuring systematic and even energy distribution across the entire face.
Treatment requires a single session for most patients. Unlike laser or ultrasound devices that often need 2-3 treatments for visible improvement, Thermage Flx delivers its full collagen-stimulating payload in one visit. This single-session protocol makes it particularly suitable for international patients visiting Gangnam who cannot schedule multiple follow-up appointments.
Who Benefits from Thermage Flx
Ideal candidates are adults aged 30-65 with mild to moderate skin laxity who want non-surgical tightening. Fitzpatrick skin types I through VI are all treatable, giving Thermage Flx an advantage over certain laser-based devices restricted to lighter skin tones. Patients with pacemakers, active skin infections in the treatment area, or metallic implants near the target zone should not undergo the procedure. Pregnant or nursing individuals are also excluded.
Thermage Flx produces the strongest results in patients whose skin retains some baseline collagen production capacity. Severely sun-damaged skin or advanced laxity requiring structural volume restoration may benefit from combining Thermage Flx with injectable fillers or thread lifting. Aesthetic Medicine Specialist Yoon-Gon Ryu evaluates each patient's collagen quality and degree of laxity before confirming candidacy.
Results Timeline and Longevity
Immediate collagen contraction produces subtle tightening visible within the first week. Progressive collagen remodeling continues for 3-6 months, with peak results appearing around month 4. A 2019 multicenter study documented an average 23% improvement in skin laxity measurements at 6 months post-treatment. Results typically last 12-24 months depending on the patient's age, skin condition, and lifestyle factors such as sun exposure and smoking status. Annual maintenance sessions extend the benefit window and compound collagen density gains over time.