# Tooth 23: Lower Left Lateral Incisor

> In the Universal Numbering System, tooth 23 is the lower left lateral incisor (mandibular left lateral incisor). Its FDI (ISO 3950) designation is 32 and its Palmer designation is 2 in the lower left quadrant. It is a incisor in the lower arch with typically 1 root.

URL: https://dentovio.com/tools/tooth-numbering-chart/tooth-23

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Last verified: 2026-07-08

Neutral tooth-designation reference only; not clinical, diagnostic, or treatment advice. Root counts describe typical permanent-tooth morphology and vary between individuals.

## Direct answer

- Which tooth is number 23? In the Universal Numbering System, tooth 23 is the lower left lateral incisor (mandibular left lateral incisor). Its FDI (ISO 3950) designation is 32 and its Palmer designation is 2 in the lower left quadrant. It is a incisor in the lower arch with typically 1 root.
- Universal number: 23
- FDI / ISO 3950 designation: 32
- Palmer designation: 2 LL
- Plain-language name: Lower Left Lateral Incisor
- Anatomical name: Mandibular Left Lateral Incisor
- Quadrant: Lower Left
- Arch and side: lower, left
- Type: incisor
- Typical roots: 1

## Conversion table

| System | Designation |
| --- | --- |
| Universal Numbering System | 23 |
| FDI / ISO 3950 | 32 |
| Palmer notation | 2 LL |
| Tooth name | Lower Left Lateral Incisor |

## Search terms

- which tooth is number 23?
- tooth 23
- tooth number 23
- universal tooth 23
- adult tooth 23
- lower left lateral incisor
- mandibular left lateral incisor
- fdi 32
- palmer 2
- lower left tooth 2
- lower left incisor

## Sources

- `TOOTH-1` American Dental Association — Universal Numbering System. <https://www.ada.org/publications/ada-news/2020/november/how-to-count-teeth-numbering-systems>
- `TOOTH-2` ISO 3950:2016 — Dentistry, designation system for teeth and areas of the oral cavity (FDI two-digit). <https://www.iso.org/standard/68292.html>
- `TOOTH-3` FDI World Dental Federation — two-digit notation. <https://www.fdiworlddental.org/>

## Related

- [Full tooth numbering chart](https://dentovio.com/tools/tooth-numbering-chart/index.html.md)
- [FDI to Universal converter](https://dentovio.com/tools/fdi-to-universal-converter/index.html.md)
- [Palmer notation converter](https://dentovio.com/tools/palmer-notation-converter/index.html.md)
- [Previous tooth: Tooth 22: Lower Left Canine](https://dentovio.com/tools/tooth-numbering-chart/tooth-22/index.html.md)
- [Next tooth: Tooth 24: Lower Left Central Incisor](https://dentovio.com/tools/tooth-numbering-chart/tooth-24/index.html.md)