Permanent tooth reference
Tooth #9: Upper left central incisor
In FDI notation, tooth #9 is 21. It is a central incisor in the upper left part of the mouth.
Tooth #9 at a glance
- Location
- upper left
- Tooth type
- central incisor
- FDI notation
- 21
- Adjacent teeth
- #8 and #10
- Opposing tooth
- #24
- Wisdom tooth
- No
What does tooth #9 identify?
Tooth #9 identifies the upper left central incisor in the Universal numbering system used in the United States. It is a front tooth. Its matching FDI designation is 21.
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.