# Tooth 14: Upper Left First Molar

> In the Universal Numbering System, tooth 14 is the upper left first molar (maxillary left first molar). Its FDI (ISO 3950) designation is 26 and its Palmer designation is 6 in the upper left quadrant. It is a molar in the upper arch with typically 3 roots.

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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 14? In the Universal Numbering System, tooth 14 is the upper left first molar (maxillary left first molar). Its FDI (ISO 3950) designation is 26 and its Palmer designation is 6 in the upper left quadrant. It is a molar in the upper arch with typically 3 roots.
- Universal number: 14
- FDI / ISO 3950 designation: 26
- Palmer designation: 6 UL
- Plain-language name: Upper Left First Molar
- Anatomical name: Maxillary Left First Molar
- Quadrant: Upper Left
- Arch and side: upper, left
- Type: molar
- Typical roots: 3

## Conversion table

| System | Designation |
| --- | --- |
| Universal Numbering System | 14 |
| FDI / ISO 3950 | 26 |
| Palmer notation | 6 UL |
| Tooth name | Upper Left First Molar |

## Search terms

- which tooth is number 14?
- tooth 14
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- universal tooth 14
- adult tooth 14
- upper left first molar
- maxillary left first molar
- fdi 26
- palmer 6
- upper left tooth 6
- upper left molar

## 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 13: Upper Left Second Premolar](https://dentovio.com/tools/tooth-numbering-chart/tooth-13/index.html.md)
- [Next tooth: Tooth 15: Upper Left Second Molar](https://dentovio.com/tools/tooth-numbering-chart/tooth-15/index.html.md)