# Tooth M: Primary Lower Left Canine

> In the Universal Numbering System, primary tooth M is the primary lower left canine (primary mandibular left canine). Its FDI (ISO 3950) designation is 73 and its Palmer designation is C 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 primary-tooth morphology and vary between individuals.

## Direct answer

- Which baby tooth is letter M? In the Universal Numbering System, primary tooth M is the primary lower left canine (primary mandibular left canine). Its FDI (ISO 3950) designation is 73 and its Palmer designation is C in the lower left quadrant. It is a canine in the lower arch with typically 1 root.
- Universal letter: M
- FDI / ISO 3950 designation: 73
- Palmer designation: C LL
- Plain-language name: Primary Lower Left Canine
- Anatomical name: Primary Mandibular Left Canine
- Quadrant: Lower Left
- Arch and side: lower, left
- Type: canine
- Typical roots: 1

## Conversion table

| System | Designation |
| --- | --- |
| Universal Numbering System | M |
| FDI / ISO 3950 | 73 |
| Palmer notation | C LL |
| Tooth name | Primary Lower Left Canine |

## Search terms

- which baby tooth is letter m?
- tooth M
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- palmer C
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- 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 L: Primary Lower Left First Molar](https://dentovio.com/tools/tooth-numbering-chart/tooth-l/index.html.md)
- [Next tooth: Tooth N: Primary Lower Left Lateral Incisor](https://dentovio.com/tools/tooth-numbering-chart/tooth-n/index.html.md)