# Which tooth is number 25?

Answer: In the Universal Numbering System, tooth 25 is the lower right central incisor (mandibular right central incisor). Its FDI (ISO 3950) designation is 41 and its Palmer designation is 1 in the lower right quadrant. It is a incisor in the lower arch with typically 1 root.

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Answer intent ID: `tooth-number-25`
Cluster: Tooth numbering reference
Last verified: 2026-07-08
Reviewer: see source page

## Direct answer

In the Universal Numbering System, tooth 25 is the lower right central incisor (mandibular right central incisor). Its FDI (ISO 3950) designation is 41 and its Palmer designation is 1 in the lower right quadrant. It is a incisor in the lower arch with typically 1 root.

## Query patterns

- Which tooth is number 25?
- Tooth 25: Lower Right Central Incisor
- Which tooth is 25?
- What is tooth number 25 in FDI and Palmer notation?
- Which tooth is FDI 41?
- What is FDI 41 in Universal numbering?
- FDI 41 to Universal tooth number
- ISO 3950 tooth 41
- Which tooth is Palmer 1 Lower Right?
- Palmer 1 Lower Right to Universal
- Lower Right Palmer 1 tooth
- LR Palmer 1 permanent tooth
- Lower Right Central Incisor tooth number
- Universal 25 FDI 41 Palmer 1
- which tooth is number 25?
- tooth 25
- tooth number 25
- universal tooth 25
- adult tooth 25
- lower right central incisor
- mandibular right central incisor
- fdi 41

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-25](https://dentovio.com/tools/tooth-numbering-chart/tooth-25)

## 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)