Permanent tooth reference
Tooth #21: Lower left first premolar
In FDI notation, tooth #21 is 34. It is a first premolar in the lower left part of the mouth.
Tooth #21 at a glance
- Location
- lower left
- Tooth type
- first premolar
- FDI notation
- 34
- Adjacent teeth
- #20 and #22
- Opposing tooth
- #12
- Wisdom tooth
- No
What does tooth #21 identify?
Tooth #21 identifies the lower left first premolar in the Universal numbering system used in the United States. It is a back tooth. Its matching FDI designation is 34.
A treatment plan or benefit statement may use the number alone. Confirm the number with the dental office if the document is unclear; a tooth number identifies location and does not explain a diagnosis or treatment by itself.