# Tooth #12 (FDI 24): upper left first premolar

> FDI tooth 24 is the upper left first premolar (quadrant 2): Universal #12, Palmer UL4. With neighbouring teeth and the full chart.

Source: https://hajto.de/en/tooth-chart/tooth-24  
Last updated: 2026-10-17T11:14:06Z  
German version: https://hajto.de/zahnschema/zahn-24.md

- **FDI (ISO 3950):** 24
- **Universal (ADA):** #12
- **Palmer:** └4 (UL4)
- **Name:** Upper left first premolar
- **Tooth type:** First premolar
- **Group:** Posterior tooth
- **Quadrant:** Quadrant 2: upper left (maxillary left)
- **Dentition:** Permanent dentition

## Neighbouring teeth

- [Tooth 23](https://hajto.de/en/tooth-chart/tooth-23.md): upper left canine
- [Tooth 25](https://hajto.de/en/tooth-chart/tooth-25.md): upper left second premolar

## Opposing tooth (same position in the opposite jaw)

- [Tooth 34](https://hajto.de/en/tooth-chart/tooth-34.md): lower left first premolar

[Interactive tooth chart](https://hajto.de/en/tooth-chart) · Reference for dentists and dental students. Notation according to the FDI two-digit system (ISO 3950) and the ADA Universal Numbering System.