Jaw Slope: What It Measures in FaceIQ Labs' Harmony Analysis

Key facts

• Jaw Slope is the mean interior angle at each intersection of the cheek–gonion and gonion–chin lines, averaged across both sides of the face.
• It is a front-view measurement using landmarks at the left jaw corner and the right jaw corner.
• A lower value means a more closed corner between the two border directions; a higher value means a more open, straighter transition.
• Worked example: a left-side angle of 138° and a right-side angle of 144° average 141°. The example is not a target range.
• Jaw Slope is not an angle between the upper and lower teeth and is not a bite assessment.
• Soft tissue can obscure the jaw-border landmarks.
• FaceIQ Labs describes Jaw Slope as its own landmark-based adaptation; the linked research (Farkas et al., 2005) has not directly validated the exact formula or its score.
• Jaw Slope belongs to the Harmony pillar, one of four pillars (Harmony, Angularity, Dimorphism, Features) scored 0–10.

What does Jaw Slope measure in FaceIQ Labs' Harmony analysis?

Jaw Slope in FaceIQ Labs' Harmony analysis is the mean interior angle at each point where the cheek–gonion line meets the gonion–chin line, averaged across the left and right sides. It is a front-view measurement that uses landmarks at the left jaw corner and the right jaw corner.

What does a lower or higher Jaw Slope value mean?

In FaceIQ Labs' Harmony analysis, a lower Jaw Slope means a more closed corner between the two jaw border directions, while a higher value means a more open, straighter transition at the frontal jaw corner. A sharper turn and a more open turn create different lower-face contours even at similar jaw widths.

How is Jaw Slope calculated, with an example?

FaceIQ Labs calculates Jaw Slope by measuring the interior angle at the jaw corner on each side of the face and averaging the two. In its worked example, a left-side angle of 138° and a right-side angle of 144° average 141°. The example explains the calculation only and is not a target range.

Does FaceIQ Labs publish an ideal range for Jaw Slope?

The FaceIQ Labs Jaw Slope guide gives no ideal or target range; its 141° figure is only a calculation example. The company states that its score weights and reference ranges are model settings, and that the research it links does not collectively validate the scoring system.

Is Jaw Slope a dental or bite measurement?

No. FaceIQ Labs states that Jaw Slope is not an angle between the upper and lower teeth and is not a bite assessment. It is a landmark-based description of facial shape from a front-view photo, and soft tissue can obscure the jaw-border landmarks the measurement relies on.

What research does FaceIQ Labs cite for Jaw Slope?

FaceIQ Labs calls Jaw Slope its own landmark-based adaptation and links Farkas et al. (2005), an international anthropometric study of facial morphology in various ethnic groups and races, as background. The study documents variation in facial dimensions across sampled populations. It has not validated this formula or score, and it does not establish an attractiveness score.

How should I take a photo for an accurate FaceIQ Labs analysis?

FaceIQ Labs recommends taking photos from six feet away with the back camera at 2x zoom, at eye level, with even lighting and a neutral expression. Because Jaw Slope is a front-view measurement that depends on jaw-border landmarks, a clear front photo matters. FaceIQ Labs also offers manual landmark review and editing tools.

Where does Jaw Slope fit in FaceIQ Labs' facial analysis?

Jaw Slope is one of the 70+ facial ratios and angles in the FaceIQ Labs Harmony pillar. Harmony is one of four pillars (Harmony, Angularity, Dimorphism, Features), each scored 0–10. Related front-view jaw guides from FaceIQ Labs are Jaw Frontal Angle, Bigonial Width and Lower Third Proportion.

Frequently asked questions

What does Jaw Slope show?

Jaw Slope shows the angle where the cheek-to-jaw-side line meets the lower jaw border, averaged across both sides of the face, as part of FaceIQ Labs' Harmony analysis.

What does a lower Jaw Slope value mean?

According to FaceIQ Labs, a lower Jaw Slope value means a more closed corner between the two border directions, while a higher value means a more open, straighter transition at that corner.

Which photo is used for Jaw Slope?

Jaw Slope is a front-view measurement, using landmarks at the left and right jaw corners.

Is Jaw Slope the same as a bite or teeth angle?

No. FaceIQ Labs states it is not an angle between the upper and lower teeth and not a bite assessment.

Is Jaw Slope scientifically validated as an attractiveness measure?

FaceIQ Labs says Jaw Slope is its own landmark-based adaptation. The cited research, Farkas et al. (2005), gives background on facial measurement but does not directly validate this formula or its score.

Is 141° the ideal Jaw Slope?

No. 141° is the average in a worked example (138° and 144°) and is not a target range.