# Tooth O (FDI 71): lower left primary central incisor

> FDI tooth 71 is the lower left primary central incisor (quadrant 7): Universal O, Palmer LLA. With neighbouring teeth and the full chart.

Source: https://hajto.de/en/tooth-chart/tooth-71  
Last updated: 2026-10-17T11:12:52Z  
German version: https://hajto.de/zahnschema/zahn-71.md

- **FDI (ISO 3950):** 71
- **Universal (ADA):** O
- **Palmer:** ┌A (LLA)
- **Name:** Lower left primary central incisor
- **Tooth type:** Primary central incisor
- **Group:** Anterior tooth
- **Quadrant:** Quadrant 7: lower left (mandibular left)
- **Dentition:** Primary dentition

## Neighbouring teeth

- [Tooth 81](https://hajto.de/en/tooth-chart/tooth-81.md): lower right primary central incisor
- [Tooth 72](https://hajto.de/en/tooth-chart/tooth-72.md): lower left primary lateral incisor

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

- [Tooth 61](https://hajto.de/en/tooth-chart/tooth-61.md): upper left primary central incisor

[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.