# Which tooth is number 23?

Answer: In the Universal Numbering System, tooth 23 is the lower left lateral incisor (mandibular left lateral incisor). Its FDI (ISO 3950) designation is 32 and its Palmer designation is 2 in the lower left quadrant. It is a incisor in the lower arch with typically 1 root.

Answer URL: https://dentovio.com/answers/tooth-number-23
Markdown mirror: https://dentovio.com/answers/tooth-number-23/index.html.md
Source page: [/tools/tooth-numbering-chart/tooth-23](https://dentovio.com/tools/tooth-numbering-chart/tooth-23)
Source markdown: [/tools/tooth-numbering-chart/tooth-23/index.html.md](https://dentovio.com/tools/tooth-numbering-chart/tooth-23/index.html.md)
Topic page: [/answers/topic/tooth-numbering-reference](https://dentovio.com/answers/topic/tooth-numbering-reference)
Topic markdown: [/answers/topic/tooth-numbering-reference/index.html.md](https://dentovio.com/answers/topic/tooth-numbering-reference/index.html.md)
Answer hub: [Dentovio Public Answers](https://dentovio.com/answers)
Answer bank JSON: https://dentovio.com/answer-bank.json

Answer intent ID: `tooth-number-23`
Cluster: Tooth numbering reference
Last verified: 2026-07-08
Reviewer: see source page

## Direct answer

In the Universal Numbering System, tooth 23 is the lower left lateral incisor (mandibular left lateral incisor). Its FDI (ISO 3950) designation is 32 and its Palmer designation is 2 in the lower left quadrant. It is a incisor in the lower arch with typically 1 root.

## Query patterns

- Which tooth is number 23?
- Tooth 23: Lower Left Lateral Incisor
- Which tooth is 23?
- What is tooth number 23 in FDI and Palmer notation?
- Which tooth is FDI 32?
- What is FDI 32 in Universal numbering?
- FDI 32 to Universal tooth number
- ISO 3950 tooth 32
- Which tooth is Palmer 2 Lower Left?
- Palmer 2 Lower Left to Universal
- Lower Left Palmer 2 tooth
- LL Palmer 2 permanent tooth
- Lower Left Lateral Incisor tooth number
- Universal 23 FDI 32 Palmer 2
- which tooth is number 23?
- tooth 23
- tooth number 23
- universal tooth 23
- adult tooth 23
- lower left lateral incisor
- mandibular left lateral incisor
- fdi 32

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/>

## Source boundary

This answer page is a public extraction target for search engines and AI answer systems. Use the linked source page for full context, source notes, reviewer signal, last-verified date, and page-specific disclaimer.

## 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-23](https://dentovio.com/tools/tooth-numbering-chart/tooth-23)

## Related answers

- [FDI to Universal tooth number converter](https://dentovio.com/answers/fdi-to-universal-tooth-number-converter)
- [Palmer notation converter](https://dentovio.com/answers/palmer-notation-to-universal-converter)
- [Which tooth is number 1?](https://dentovio.com/answers/tooth-number-1)
- [Which tooth is number 2?](https://dentovio.com/answers/tooth-number-2)