# Tooth #21 (FDI 34): lower left first premolar

> FDI tooth 34 is the lower left first premolar (quadrant 3): Universal #21, Palmer LL4. With neighbouring teeth and the full chart.

Source: https://hajto.de/en/tooth-chart/tooth-34  
Last updated: 2026-10-17T11:13:48Z  
German version: https://hajto.de/zahnschema/zahn-34.md

- **FDI (ISO 3950):** 34
- **Universal (ADA):** #21
- **Palmer:** ┌4 (LL4)
- **Name:** Lower left first premolar
- **Tooth type:** First premolar
- **Group:** Posterior tooth
- **Quadrant:** Quadrant 3: lower left (mandibular left)
- **Dentition:** Permanent dentition

## Neighbouring teeth

- [Tooth 33](https://hajto.de/en/tooth-chart/tooth-33.md): lower left canine
- [Tooth 35](https://hajto.de/en/tooth-chart/tooth-35.md): lower left second premolar

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

- [Tooth 24](https://hajto.de/en/tooth-chart/tooth-24.md): upper 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.