# Which baby tooth is letter N?

Answer: In the Universal Numbering System, primary tooth N is the primary lower left lateral incisor (primary mandibular left lateral incisor). Its FDI (ISO 3950) designation is 72 and its Palmer designation is B in the lower left quadrant. It is a incisor in the lower arch with typically 1 root.

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

## Direct answer

In the Universal Numbering System, primary tooth N is the primary lower left lateral incisor (primary mandibular left lateral incisor). Its FDI (ISO 3950) designation is 72 and its Palmer designation is B in the lower left quadrant. It is a incisor in the lower arch with typically 1 root.

## Query patterns

- Which baby tooth is letter N?
- Tooth N: Primary Lower Left Lateral Incisor
- Which tooth is N?
- What is baby tooth N in FDI and Palmer notation?
- Which tooth is FDI 72?
- What is FDI 72 in Universal numbering?
- FDI 72 to Universal tooth number
- ISO 3950 tooth 72
- Which tooth is Palmer B Lower Left?
- Palmer B Lower Left to Universal
- Lower Left Palmer B tooth
- LL Palmer B primary tooth
- Primary Lower Left Lateral Incisor tooth number
- Universal N FDI 72 Palmer B
- which baby tooth is letter n?
- tooth N
- tooth letter N
- baby tooth N
- primary tooth N
- primary lower left lateral incisor
- primary mandibular left lateral incisor
- fdi 72

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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- [/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-n](https://dentovio.com/tools/tooth-numbering-chart/tooth-n)

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