Technology

Thermage FLX

Thermage FLX is a non-invasive treatment that uses monopolar radiofrequency energy to heat the deeper skin with the aim of tightening and smoothing.

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About this technology

Understanding Thermage FLX.

Thermage FLX is a non-invasive skin-tightening device that uses monopolar radiofrequency energy. A treatment tip is passed over the skin, delivering radiofrequency that heats the deeper layers while the surface is cooled at the same time to help protect it and add comfort. Because it works through the intact skin, it does not require needles or incisions. It is a medical device operated under qualified supervision, and the decision to treat, along with the choice of tip and area, is made through a physician-led assessment; the technology itself does not determine that treatment is right for a particular person.

How does Thermage FLX work?

Radiofrequency energy creates heat as it meets resistance in the skin's tissue, and Thermage delivers this heat volumetrically to the deeper dermis and, depending on the tip, underlying layers. The immediate heating causes existing collagen to contract, which can produce a subtle tightening, while the controlled thermal effect also stimulates the skin's natural repair process, prompting new collagen to form gradually over the following months. A cooling burst is delivered with each pulse to help protect the surface, and newer versions incorporate features intended to help deliver energy more evenly and comfortably.

Clinical uses

Thermage FLX is used for non-surgical tightening of skin showing mild laxity, commonly on the face and jawline, the delicate skin around the eyes, and areas of the body such as the abdomen and thighs. It is generally suited to gradual firming rather than dramatic lifting, and it does not remove excess skin or replace surgery. What a device is specifically authorized to treat, what it is commonly used for, and uses backed by evidence but considered off-label can differ, and a clinician can clarify which applies. Results vary between individuals, and it is not a substitute for a surgical procedure when significant laxity is present.

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Potential benefits

Thermage FLX is a non-invasive approach to mild skin laxity, typically completed in a single session per area with little or no interruption to normal activities for most people, since it works through intact skin without needles or incisions. Built-in cooling is designed to protect the surface and add comfort. Results tend to appear gradually as collagen renews. These are general characteristics of the technology rather than a promise of a specific degree of tightening; how much benefit any individual sees depends on their skin, degree of laxity and expectations, which should be discussed with a clinician.

Ask Whether One Session Would Meet Your Firming Goal →

Safety and considerations

Common short-term effects include redness, mild swelling and a warm sensation during and after treatment, which usually settle quickly. Less commonly, temporary surface changes, blistering, small areas of pigment change, or lumps and dents beneath the skin can occur, and these are generally uncommon with appropriate technique. The heat can be felt strongly in sensitive areas, and the treatment is generally avoided in those with certain implanted electronic devices, over some implants, during pregnancy, or in certain skin conditions. Expectations should be realistic, as it addresses mild laxity rather than replacing surgery. A clinical assessment is needed to determine whether treatment is appropriate for you.

Tell Us About Implanted Devices Before Radiofrequency →

Related Treatments

Treatments that may utilize this technology.

Non-Surgical Skin Tightening

Uses controlled heat or focused energy to stimulate gradual collagen remodelling and modestly firm the skin without surgery.

Read treatment page →

Conditions It May Help Address

Concerns connected to this technology.

The relationship between a technology and a concern depends on the treatment plan, patient assessment, and how the technology is being used.

Fine Lines and Wrinkles

Visible facial creases that develop from repeated expression, collagen loss, sun exposure and skin dryness.

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Loose or Crepey Skin

Reduced firmness and mild tissue descent related to aging and the decline of collagen and elastin.

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Neck Laxity and Neck Lines

Loose neck skin, horizontal creases, or visible muscle bands that can reduce definition of the neck and jawline.

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FAQ

Questions about Thermage FLX.

No. Thermage is a non-invasive treatment aimed at mild skin laxity and gradual firming; it does not remove excess skin or reposition tissue the way surgery does. If you have significant laxity, a clinician can discuss whether a surgical option would better match your goals.

Some people notice a subtle tightening soon after treatment from collagen contraction, but the more meaningful change tends to form gradually over several months as new collagen forms. The degree and timing vary between individuals, which is best discussed during an assessment.

Thermage is often performed as a single session per area, though this can vary with the concern and the response. A clinician can advise whether one session is likely to meet your goals or whether a repeat treatment might be considered over time.

Because it works through intact skin without needles or incisions, most people have only temporary redness, warmth or mild swelling and can usually return to normal activities the same day. Individual experiences differ, and your clinician can tell you what to expect for the area being treated.

Each pulse combines a heating sensation with a cooling burst intended to protect the skin and add comfort, and sensitivity varies by area and individual. Some people find sensitive areas more intense. Your clinician can talk through comfort measures used during treatment.

Reviews

What patients say about the clinic experience.

Reviews help show the human side of care, from the first consultation to comfort, communication, treatment planning, and follow-up.

Medical Review

Reviewed for clinical accuracy.

Medically reviewed by Dr. Gidon Frame, Medical Director, Anti-Aging Medical & Laser Clinic (CPSBC).
Last medically reviewed: August 2026.
Evidence reviewed: clinical practice guidelines, systematic reviews and peer-reviewed medical literature.

AuthorDr. Gidon Frame
Medical ReviewerDr. Gidon Frame
Last ReviewedAugust 2026
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