Muscle & Fat · January 15, 2026 · 6 min · By Jasmine Holloway
Treating a double chin and submental fullness
Fat under the chin blurs the jawline, and there are several fixes.

A common reason a jawline looks undefined is not the bone at all but fat under the chin, submental fullness, or a double chin, and addressing it can sharpen the jawline and profile considerably.
Submental fat collects under the chin and obscures the contour between the chin and neck, blurring the jawline even in people of normal weight, and it is often genetic and resistant to diet and exercise. Several treatments target it. Injectable deoxycholic acid is a non-surgical option that dissolves the fat over a series of sessions, with some swelling and downtime. Liposuction of the submental area surgically removes the fat in one procedure for a more dramatic, immediate result. CoolSculpting offers a non-surgical fat-freezing alternative for suitable cases. Skin laxity, if present, may need separate tightening, since removing fat from beneath loose skin can reveal sagging.
The choice depends on the amount of fat, skin quality, and the patient's preference for surgical versus non-surgical and downtime tolerance. For a defined jawline, addressing submental fat is frequently the key step, sometimes combined with jawline and chin filler if the chin is also recessed. The encouraging point is that a double chin obscuring an otherwise good jawline is very treatable, and reducing it often reveals a much sharper profile. An assessment of whether the issue is fat, skin, bone, or a combination guides the right approach, and treating the actual cause, often the submental fat, is what restores jawline definition.
Related reading: Chin implant vs. genioplasty: permanent chin enhancement.