Tooth 24 (FDI): maxillary left first premolar
Quick answer
- Tooth 24 in FDI is Universal 12 and Palmer UL4: the maxillary left first premolar.
The three numbers
| System | Number |
|---|---|
| FDI | 24 |
| Universal | 12 |
| Palmer | UL4 |
Careful with plain numbers: Universal 24 is a different tooth, the mandibular left central incisor (FDI 31).
About this tooth
- Name
- Maxillary left first premolar
- Set
- Adult (permanent)
- Position
- Upper arch, patient left (upper left, quadrant 2)
- Erupts
- 10 to 11 years
- Roots
- 1 or 2
- Root canals
- 2
- Crown surfaces
- Mesial, distal, buccal, palatal (lingual) and occlusal.
- Also written
- #12 (Universal), 2.4 (FDI with a dot), upper left 4, first bicuspid
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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