# Nasomental Angle

Harmony · Side view · Nose · https://www.faceiqlabs.com/support/harmony/nasomental-angle

The angle at the nose tip between the nasal-root line and the chin line.

## What is measured

Calculation: Angle: nasion → pronasale → pogonion

Nasion means the nasal root, subnasale the nose base, and pogonion the most forward chin point. Frankfort refers to the direction from the ear-opening landmark to the lower orbital landmark.

## Why it matters

It relates the nose and chin directly. This can explain why changing chin projection alters profile balance even though the nose itself is unchanged.

- Lower: a more closed root–tip–chin angle.
- Higher: a more open relationship at the tip.

## Where the idea comes from

Evidence: Clinical reference. Nasal angles and projection are used to describe profile shape. Preference studies have tested edited noses; FaceIQ’s particular landmarks and score ranges should not be treated as universal conclusions from those studies.

## A worked example

Two profiles may share the same nose, but a different chin point can give 125° in one and 135° in the other.

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

## How to read your result

The vertex is the nose tip. Nasofacial Angle uses the nasal root as its vertex, so the two are not interchangeable.

## 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.

- Tavakoli et al. (2023). [Ideal Nasal Preferences: A Quantitative Investigation with 3D Imaging in the Iranian Population](https://pubmed.ncbi.nlm.nih.gov/37564715/). Asked 203 volunteers to rate edited nose features on one male and one female model. Supports studying angles and projection together, with limits from the sampled faces and raters.

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