How Tune Face RF Lifting Shakes Water Molecules in the Dermis to Sharpen the Jawline, and How Long It Lasts

Tune Face is one of the names that comes up often when people want to soften a sagging jawline without going under the knife. It works by delivering heat through radiofrequency energy, but the name alone does not tell you much about how it actually works. In practice, Tune Face refers to a treatment built around one specific device, and understanding the order in which that device's heat acts inside the skin makes the whole thing much easier to follow. Here is a breakdown of how it tightens the jawline, step by step.

What Device Is Tune Face Actually Done With?

Tune Face is less a proprietary brand name for the procedure itself and more a label attached to treatments performed with Accent Prime, an RF device made by the Israeli company Alma Lasers. Different clinics may call it by different names, but the underlying physics inside the device is the same everywhere.

This device uses monopolar RF, meaning a single-pole current path. Current enters through an electrode placed against the skin's surface, travels through the body, and exits through a wide grounding pad attached elsewhere on the skin. Along the way, resistance in the tissue the current passes through generates heat, and that heat is the core ingredient of the treatment. The wider the grounding pad, the more evenly the current spreads out instead of concentrating in one spot, which means the heat ends up concentrated where the narrow treatment tip actually touches.

Some RF lifting devices on the market use a bipolar setup instead, with both electrodes built into the handpiece. Bipolar RF only generates heat in the shallow layer between the two electrodes, while monopolar RF, because the current travels a deeper path through the body, can carry heat further down into the tissue. That is why monopolar devices are commonly chosen for areas like the jawline, where treatment needs to reach beneath the dermis.

What Does 40.68 MHz Actually Mean?

The RF frequency Tune Face uses is 40.68 MHz. That means the current's direction reverses more than 40 million times per second. When current that changes direction this quickly passes through the skin, it grabs onto molecules like water, whose two ends carry opposite charges, and pulls them back and forth along with the changing current, making them vibrate rapidly.

It helps to think of it as similar to how a microwave oven heats food by shaking the water molecules inside it. The difference is that a microwave sends out electromagnetic waves, while Tune Face passes actual electrical current directly through the body. As the molecules vibrate and collide with each other, friction generates heat, and that heat spreads evenly through the dermis, raising the tissue's temperature.

How Heat Tightens the Jawline Instantly

Collagen, the main structural protein in the dermis, is naturally coiled into a spiral shape. When heat above a certain temperature hits these strands, the spiral structure briefly unwinds and the strand itself shortens. It is a bit like a stretched spring contracting the moment it is heated.

When collagen strands shorten this way, the surrounding skin tissue tightens along with them, which is why the jawline can look more defined right after treatment. But because this contraction is a physical reaction, the tissue tends to gradually relax again over time. That means this instant response alone is not enough to produce results that last.

Why Fibroblasts Kick In Later

Instant contraction from heat alone cannot keep results going for long. That is where a second response has to come in: fibroblasts producing new collagen.

The skin treats heat above a certain threshold as a sign of injury. Much like the body's healing response kicking in after a wound, heated dermis triggers a repair response that draws fibroblasts, the cells responsible for making collagen, to the area. Over the following weeks and months, these cells gradually build new collagen and elastin.

In other words, the change visible right after treatment comes from existing collagen contracting under heat, while the change that shows up months later comes from newly built collagen accumulating. The two effects overlap in time, and that overlap is what keeps the results going.

Why Intensity Is Adjusted by Area

Skin, fat, and muscle thickness vary across the face. A fat-padded area like the cheek and a bony area like the jawline need heat to reach different depths, and require different amounts of energy to get there.

That is why Tune Face adjusts power output and contact time differently depending on the area being treated. Applying the same intensity everywhere would overheat thinner areas while under-delivering heat to thicker ones. Checking skin and fat thickness beforehand and calibrating intensity accordingly is what makes this adjustment necessary.

Areas with thin skin sitting right over bone, like around the eyes or the forehead, heat up differently than areas with a thick fat layer, like under the chin. In thin areas, heat spreads quickly and surface temperature rises fast. In thicker areas, the same amount of time delivers a slower temperature rise. So the handpiece's pass speed and number of repetitions are adjusted by area, aiming to bring the dermis in every region up to a similar target temperature.

Why a Cooling Mechanism Runs Alongside the Heat

While RF energy is delivering heat into the dermis, the skin's surface temperature rises too. If the epidermis gets too hot, it can lead to burns, so cooling the surface matters just as much as delivering the heat itself.

Tune Face uses a chilled tip that makes direct contact with the skin. It works something like applying ice, keeping the epidermis cool while heat continues to travel down into the dermis beneath it. The surface stays cool while only the deeper layer heats up, which lowers the risk of pain and burns while still allowing the dermis to reach a high enough temperature.

What Determines How Long Results Last

How long Tune Face's results last is not decided by a single factor. Several things are known to work together, including the following.

• Skin age and baseline collagen levels: As people age, the fibroblasts that produce collagen become less active, so the amount of new collagen generated from the same heat stimulus can vary quite a bit from person to person.
• Number of sessions and spacing between them: Since building collagen takes weeks to months, spacing out multiple sessions to match this recovery cycle tends to build a cumulative effect.
• UV exposure and lifestyle habits: UV light increases the activity of enzymes that break down newly formed collagen, so skipping sun protection can cause collagen built up through treatment to fade faster.
• Existing degree of skin and fat laxity: The more pronounced the sagging to begin with, the smaller the portion that physical contraction alone can address, so how much change to expect also varies by individual.

For that reason, it makes more sense to think of a single Tune Face session as part of ongoing maintenance rather than expecting one treatment to last a lifetime.

What to Keep in Mind During Aftercare

The first few days after treatment are when the dermis's repair response is just getting started, so aftercare that does not interfere with this process helps.

Avoiding environments that add extra heat to the face, like saunas or steam rooms, for a few days is generally recommended. Adding more heat to tissue that has already been heated once can cause the repair response to overreact. Being more diligent than usual about sunscreen is also advised, since skin that is actively recovering can be more sensitive to UV exposure. Swelling and redness are often reported to settle down naturally over time, though recovery speed varies from person to person.

References

Korean Dermatological Association, American Academy of Dermatology (AAD), and Ministry of Food and Drug Safety (MFDS).