# Tooth I (FDI 64): upper left primary first molar

> FDI tooth 64 is the upper left primary first molar (quadrant 6): Universal I, Palmer ULD. With neighbouring teeth and the full chart.

Source: https://hajto.de/en/tooth-chart/tooth-64  
Last updated: 2026-10-17T11:13:12Z  
German version: https://hajto.de/zahnschema/zahn-64.md

- **FDI (ISO 3950):** 64
- **Universal (ADA):** I
- **Palmer:** └D (ULD)
- **Name:** Upper left primary first molar
- **Tooth type:** Primary first molar
- **Group:** Posterior tooth
- **Quadrant:** Quadrant 6: upper left (maxillary left)
- **Dentition:** Primary dentition

## Neighbouring teeth

- [Tooth 63](https://hajto.de/en/tooth-chart/tooth-63.md): upper left primary canine
- [Tooth 65](https://hajto.de/en/tooth-chart/tooth-65.md): upper left primary second molar

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

- [Tooth 74](https://hajto.de/en/tooth-chart/tooth-74.md): lower left primary first molar

[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.