Tooth 18 (FDI): maxillary right third molar
Quick answer
- Tooth 18 in FDI is Universal 1 and Palmer UR8: the maxillary right third molar.
The three numbers
| System | Number |
|---|---|
| FDI | 18 |
| Universal | 1 |
| Palmer | UR8 |
Careful with plain numbers: Universal 18 is a different tooth, the mandibular left second molar (FDI 37).
About this tooth
- Name
- Maxillary right third molar
- Set
- Adult (permanent)
- Position
- Upper arch, patient right (upper right, quadrant 1)
- Erupts
- 17 to 21 years
- Roots
- 3
- Root canals
- 3 or more
- Crown surfaces
- Mesial, distal, buccal, palatal (lingual) and occlusal.
- Also written
- #1 (Universal), 1.8 (FDI with a dot), upper right 8, wisdom tooth
Read on 23 October 2026. Sources: American Dental Association, Tooth development charts (primary and permanent); Number of roots and canals, from Ingle's Endodontics; Dental anatomy, citing Ash and Nelson, Wheeler's Dental Anatomy, Physiology and Occlusion. Ages and counts are usual figures, and teeth vary from person to person.
On the chart
Teeth next to it
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