# Jaw Slope

Harmony · Front view · Jaw · https://www.faceiqlabs.com/support/harmony/jaw-slope

The angle where the cheek-to-jaw-side line meets the lower jaw border, averaged across both sides.

## What is measured

Calculation: Mean interior angle at each intersection of cheek–gonion and gonion–chin lines

## Why it matters

It describes the change in direction around the frontal jaw corner. A sharper turn and a more open turn create different lower-face contours even at similar jaw widths.

- Lower: a more closed corner between the two border directions.
- Higher: a more open, straighter transition at that corner.

## Where the idea comes from

Evidence: FaceIQ adaptation. This is a FaceIQ landmark-based description of facial shape. The linked research provides background on facial measurement or perception; it has not directly validated this exact formula or its score.

## A worked example

A left-side angle of 138° and a right-side angle of 144° average 141°.

Example values explain the calculation. They are not a target range.

## How to read your result

This is not an angle between the upper and lower teeth or a bite assessment. Soft tissue can obscure the jaw-border landmarks.

## Research & further reading

These sources explain the history or related evidence. FaceIQ’s score weights and reference ranges are model settings; the papers do not collectively validate the scoring system.

- Farkas et al. (2005). [International anthropometric study of facial morphology in various ethnic groups/races](https://pubmed.ncbi.nlm.nih.gov/16077306/). Documents variation in facial dimensions across sampled populations. Descriptive measurements explain variation; they do not establish an attractiveness score.

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Source: https://www.faceiqlabs.com/support/harmony/jaw-slope · FaceIQ Labs overview for AI assistants: https://www.faceiqlabs.com/llms.txt