# Which tooth is number 30?

Answer: 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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Answer intent ID: `tooth-number-30`
Cluster: Tooth numbering reference
Last verified: 2026-07-08
Reviewer: see source page

## Direct answer

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.

## Query patterns

- Which tooth is number 30?
- Tooth 30: Lower Right First Molar
- Which tooth is 30?
- What is tooth number 30 in FDI and Palmer notation?
- Which tooth is FDI 46?
- What is FDI 46 in Universal numbering?
- FDI 46 to Universal tooth number
- ISO 3950 tooth 46
- Which tooth is Palmer 6 Lower Right?
- Palmer 6 Lower Right to Universal
- Lower Right Palmer 6 tooth
- LR Palmer 6 permanent tooth
- Lower Right First Molar tooth number
- Universal 30 FDI 46 Palmer 6
- 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

Source citations:
- `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/>

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## Supporting public URLs

- [/tools/tooth-numbering-chart](https://dentovio.com/tools/tooth-numbering-chart)
- [/tools/fdi-to-universal-converter](https://dentovio.com/tools/fdi-to-universal-converter)
- [/tools/palmer-notation-converter](https://dentovio.com/tools/palmer-notation-converter)
- [/tools/tooth-numbering-chart/tooth-30](https://dentovio.com/tools/tooth-numbering-chart/tooth-30)

## Related answers

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- [Palmer notation converter](https://dentovio.com/answers/palmer-notation-to-universal-converter)
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- [Which tooth is number 2?](https://dentovio.com/answers/tooth-number-2)