Tooth 34 (FDI): mandibular left first premolar
Quick answer
- Tooth 34 in FDI is Universal 21 and Palmer LL4: the mandibular left first premolar.
The three numbers
| System | Number |
|---|---|
| FDI | 34 |
| Universal | 21 |
| Palmer | LL4 |
About this tooth
- Name
- Mandibular left first premolar
- Set
- Adult (permanent)
- Position
- Lower arch, patient left (lower left, quadrant 3)
- Erupts
- 10 to 12 years
- Roots
- 1
- Root canals
- 1
- Crown surfaces
- Mesial, distal, buccal, lingual and occlusal.
- Also written
- #21 (Universal), 3.4 (FDI with a dot), lower 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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