Square Jaw | Broad Jaw | Non-Surgical Jaw Reduction

square jaw

A square lower jaw is generally considered a very masculine trait. Widening of the lower third of the face can cause either a square appearance to the face as a whole or can distort the natural appearance of the angle between the chin and the neck.

A wide lower face can primarily be caused by enlargement of the mandible or masseter muscle.

How to recognize and define a woman with a strong jaw ?

square jaw front viewFrontal criterias of a large jaw woman:

• B-B’ jaw width is almost equal to D-D’ cheekbones width. The closer, the squarer. On extremely square jawed women, B-B’ width is SUPERIOR to D-D’ cheekbone width

• Width between D and D’ and B-B’ is higher than for regular woman.

• TCV angle is wider than for average woman.

• Face height measured from D-D’ to C (chin) may be smaller than on average woman, because the face is more compact and the jaw squarer.

Overall aspect of the face looks healthy and square. The “jaw box” is taking more place.

woman with big jaw side view woman with average jaw - side view
Woman with a big, long, strong jaw – profile:

  • B-C line, the jaw plane, is straight, almost parallel to the floor.
  • There is a notable A-B distance. A-B is perpendicular to the floor.
  • B is an angle. The smaller the angle, the squarer the jaw. Angle is 90 degrees on very square jawed women
  • Chin and cheekbones are often projecting
  • Skin under jaw is very tight. Double chin is rare or will appear at a later age.
  • Mandible is often heavily muscular and strong
Average woman – profile:

  • No notable angle at B. No notable A-B line. You could almost draw a line from the ear lobe right to the chin point.
  • B-C is curve.
  • Chin and cheekbones are less projecting.
  • Mandible bone is thinner, less muscular.
  • More prone to double chin.


The primary cause of an enlarged mandible is developmental or congenital. There are some rare disorders that can further widen the jaw such as acromegaly.

Like any muscle, the jaw muscles increase in size with exercise. Behaviors such as repeated gum chewing, teeth clenching, teeth grinding or bruxism can contribute to enlargement of the muscle.


There are several jaw reduction techniques available—both surgical and non-surgical. Ideally prior to selection of a treatment, the patient is examined to determine whether the cause is due to the bone, the masseter or both.

If the oversize jaw is primarily caused by enlargement of the enlarged muscle, patient can opt for convenient non-surgical method with simple injections.

When the enlarged muscle is injected, it weakens and exercises less, so it slowly becomes smaller over times. This treatment is a fast procedure that has very minimal discomfort. There is generally no down-time and improvement is gradual and natural looking. Patient will receive comments that their face look slimmer without obvious signs of treatment done.

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