# Tooth 25: Lower Right Central Incisor

> 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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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 25? 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.
- Universal number: 25
- FDI / ISO 3950 designation: 41
- Palmer designation: 1 LR
- Plain-language name: Lower Right Central Incisor
- Anatomical name: Mandibular Right Central Incisor
- Quadrant: Lower Right
- Arch and side: lower, right
- Type: incisor
- Typical roots: 1

## Conversion table

| System | Designation |
| --- | --- |
| Universal Numbering System | 25 |
| FDI / ISO 3950 | 41 |
| Palmer notation | 1 LR |
| Tooth name | Lower Right Central Incisor |

## Search terms

- which tooth is number 25?
- tooth 25
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- universal tooth 25
- adult tooth 25
- lower right central incisor
- mandibular right central incisor
- fdi 41
- palmer 1
- lower right tooth 1
- lower right incisor

## 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 24: Lower Left Central Incisor](https://dentovio.com/tools/tooth-numbering-chart/tooth-24/index.html.md)
- [Next tooth: Tooth 26: Lower Right Lateral Incisor](https://dentovio.com/tools/tooth-numbering-chart/tooth-26/index.html.md)