TL;DR: A double chin is usually a combination of submental fat and skin laxity. The ratio between those two determines what will actually work. Exercise and diet reduce overall fat but do not tighten loose skin or remove localised submental deposits once formed. HIFU is currently the most clinically supported non-surgical option for treating both fat and laxity beneath the chin in one treatment.

What Causes a Double Chin? (Fat vs Skin Laxity)

There are two different concerns that both look like a double chin:

  • Submental fat — a pocket of fat beneath the chin that can exist regardless of body weight due to genetics.
  • Skin laxity — loss of collagen and elasticity causing the skin to sag forward.

Most people have a combination of both. Knowing which one is dominant determines the correct treatment.

Why Exercise and Diet Don’t Remove a Double Chin

Weight loss reduces fat across the body, including under the chin. However:

  • Spot reduction is not physiologically possible.
  • Exercise does not tighten loose skin.

Jaw exercises may strengthen the platysma muscle, but muscle tone is rarely the limiting factor in visible submental fullness.

Best Non-Surgical Double Chin Treatment: HIFU Explained

HIFU (High-Intensity Focused Ultrasound) delivers focused ultrasound energy beneath the chin at depths of 1.5mm, 3mm and 4.5mm.

At these depths, it:

  • Stimulates collagen production in the deep dermis
  • Tightens the SMAS layer at 4.5mm depth
  • Creates gradual lifting and contour definition

Results develop over two to three months as collagen remodelling completes.

HIFU vs RF Skin Tightening for Double Chin

RF skin tightening works at shallower depths and is best suited to mild laxity.

HIFU reaches deeper structural layers, which is why it tends to produce more noticeable lifting in the submental area.

They are different tools for different tissue depths.

When Is Double Chin Surgery Actually Necessary?

Liposuction and surgical neck lifts produce more dramatic correction in a single procedure. They are appropriate when:

  • There is significant excess skin
  • Fat deposits are substantial
  • Laxity is advanced

Most mild-to-moderate concerns do not require surgery.

What HIFU Won’t Fix

HIFU will not remove large fat volumes. It is not a primary fat-destruction treatment like deoxycholic acid injections or liposuction.

Results are gradual, not immediate, and typically last 12–18 months before maintenance is recommended.

Combining HIFU and RF Microneedling (Sylfirm X)

Sylfirm X improves skin texture and collagen density in the upper dermis.

When combined with HIFU, it addresses both deep structural laxity and surface skin quality — producing more refined jawline definition.

Is HIFU Right for Your Double Chin?

If you have mild to moderate submental fullness and early laxity, HIFU may be an appropriate non-surgical treatment option.

For a personalised assessment, book a consultation at Fresh Skin Clinic Perth in Ardross.

Ana Belen Zaza is the founder of Fresh Skin Clinic Perth and has specialised in advanced skin treatments for nearly three decades.