# Tooth 22: Lower Left Canine

> In the Universal Numbering System, tooth 22 is the lower left canine (mandibular left canine). Its FDI (ISO 3950) designation is 33 and its Palmer designation is 3 in the lower left quadrant. It is a canine in the lower arch with typically 1 root.

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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 22? In the Universal Numbering System, tooth 22 is the lower left canine (mandibular left canine). Its FDI (ISO 3950) designation is 33 and its Palmer designation is 3 in the lower left quadrant. It is a canine in the lower arch with typically 1 root.
- Universal number: 22
- FDI / ISO 3950 designation: 33
- Palmer designation: 3 LL
- Plain-language name: Lower Left Canine
- Anatomical name: Mandibular Left Canine
- Quadrant: Lower Left
- Arch and side: lower, left
- Type: canine
- Typical roots: 1

## Conversion table

| System | Designation |
| --- | --- |
| Universal Numbering System | 22 |
| FDI / ISO 3950 | 33 |
| Palmer notation | 3 LL |
| Tooth name | Lower Left Canine |

## Search terms

- which tooth is number 22?
- tooth 22
- tooth number 22
- universal tooth 22
- adult tooth 22
- lower left canine
- mandibular left canine
- fdi 33
- palmer 3
- lower left tooth 3
- lower left canine

## 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 21: Lower Left First Premolar](https://dentovio.com/tools/tooth-numbering-chart/tooth-21/index.html.md)
- [Next tooth: Tooth 23: Lower Left Lateral Incisor](https://dentovio.com/tools/tooth-numbering-chart/tooth-23/index.html.md)