# Which tooth is number 16?

Answer: In the Universal Numbering System, tooth 16 is the upper left third molar (maxillary left third molar). Its FDI (ISO 3950) designation is 28 and its Palmer designation is 8 in the upper left quadrant. It is a molar in the upper arch with typically 3 roots.

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Answer intent ID: `tooth-number-16`
Cluster: Tooth numbering reference
Last verified: 2026-07-08
Reviewer: see source page

## Direct answer

In the Universal Numbering System, tooth 16 is the upper left third molar (maxillary left third molar). Its FDI (ISO 3950) designation is 28 and its Palmer designation is 8 in the upper left quadrant. It is a molar in the upper arch with typically 3 roots.

## Query patterns

- Which tooth is number 16?
- Tooth 16: Upper Left Third Molar
- Which tooth is 16?
- What is tooth number 16 in FDI and Palmer notation?
- Which tooth is FDI 28?
- What is FDI 28 in Universal numbering?
- FDI 28 to Universal tooth number
- ISO 3950 tooth 28
- Which tooth is Palmer 8 Upper Left?
- Palmer 8 Upper Left to Universal
- Upper Left Palmer 8 tooth
- UL Palmer 8 permanent tooth
- Upper Left Third Molar tooth number
- Universal 16 FDI 28 Palmer 8
- which tooth is number 16?
- tooth 16
- tooth number 16
- universal tooth 16
- adult tooth 16
- upper left third molar
- maxillary left third molar
- fdi 28

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-16](https://dentovio.com/tools/tooth-numbering-chart/tooth-16)

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