# Tooth 30: Lower Right First Molar

> In the Universal Numbering System, tooth 30 is the lower right first molar (mandibular right first molar). Its FDI (ISO 3950) designation is 46 and its Palmer designation is 6 in the lower right quadrant. It is a molar in the lower arch with typically 2 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 30? In the Universal Numbering System, tooth 30 is the lower right first molar (mandibular right first molar). Its FDI (ISO 3950) designation is 46 and its Palmer designation is 6 in the lower right quadrant. It is a molar in the lower arch with typically 2 roots.
- Universal number: 30
- FDI / ISO 3950 designation: 46
- Palmer designation: 6 LR
- Plain-language name: Lower Right First Molar
- Anatomical name: Mandibular Right First Molar
- Quadrant: Lower Right
- Arch and side: lower, right
- Type: molar
- Typical roots: 2

## Conversion table

| System | Designation |
| --- | --- |
| Universal Numbering System | 30 |
| FDI / ISO 3950 | 46 |
| Palmer notation | 6 LR |
| Tooth name | Lower Right First Molar |

## Search terms

- which tooth is number 30?
- tooth 30
- tooth number 30
- universal tooth 30
- adult tooth 30
- lower right first molar
- mandibular right first molar
- fdi 46
- palmer 6
- lower right tooth 6
- lower right 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 29: Lower Right Second Premolar](https://dentovio.com/tools/tooth-numbering-chart/tooth-29/index.html.md)
- [Next tooth: Tooth 31: Lower Right Second Molar](https://dentovio.com/tools/tooth-numbering-chart/tooth-31/index.html.md)