Dentovio public answer
Which tooth is number 9?
In the Universal Numbering System, tooth 9 is the upper left central incisor (maxillary left central incisor). Its FDI (ISO 3950) designation is 21 and its Palmer designation is 1 in the upper left quadrant. It is a incisor in the upper arch with typically 1 root.
- Cluster
- Tooth numbering reference
- Last verified
- 2026-07-08
- Reviewer
- See source page
Answer extraction boundary
This page is a focused public extraction target for search engines and AI answer systems. Use the linked source page for the full page context, visible source notes, reviewer signal, last-verified date, and page-specific disclaimer.
Query patterns
- Which tooth is number 9?
- Tooth 9: Upper Left Central Incisor
- Which tooth is 9?
- What is tooth number 9 in FDI and Palmer notation?
- Which tooth is FDI 21?
- What is FDI 21 in Universal numbering?
- FDI 21 to Universal tooth number
- ISO 3950 tooth 21
- Which tooth is Palmer 1 Upper Left?
- Palmer 1 Upper Left to Universal
- Upper Left Palmer 1 tooth
- UL Palmer 1 permanent tooth
- Upper Left Central Incisor tooth number
- Universal 9 FDI 21 Palmer 1
- which tooth is number 9?
- tooth 9
- tooth number 9
- universal tooth 9
- adult tooth 9
- upper left central incisor
- maxillary left central incisor
- fdi 21