# Tooth 29: Lower Right Second Premolar

> In the Universal Numbering System, tooth 29 is the lower right second premolar (mandibular right second premolar). Its FDI (ISO 3950) designation is 45 and its Palmer designation is 5 in the lower right quadrant. It is a premolar 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 29? In the Universal Numbering System, tooth 29 is the lower right second premolar (mandibular right second premolar). Its FDI (ISO 3950) designation is 45 and its Palmer designation is 5 in the lower right quadrant. It is a premolar in the lower arch with typically 1 root.
- Universal number: 29
- FDI / ISO 3950 designation: 45
- Palmer designation: 5 LR
- Plain-language name: Lower Right Second Premolar
- Anatomical name: Mandibular Right Second Premolar
- Quadrant: Lower Right
- Arch and side: lower, right
- Type: premolar
- Typical roots: 1

## Conversion table

| System | Designation |
| --- | --- |
| Universal Numbering System | 29 |
| FDI / ISO 3950 | 45 |
| Palmer notation | 5 LR |
| Tooth name | Lower Right Second Premolar |

## Search terms

- which tooth is number 29?
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- fdi 45
- palmer 5
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- lower right premolar

## 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 28: Lower Right First Premolar](https://dentovio.com/tools/tooth-numbering-chart/tooth-28/index.html.md)
- [Next tooth: Tooth 30: Lower Right First Molar](https://dentovio.com/tools/tooth-numbering-chart/tooth-30/index.html.md)