Tooth #1 – Upper right wisdom tooth
8th tooth back from the middle, upper right.
- International
- 18
- Palmer
- 8
- Type
- Molar
- Roots
- 3
- Canals
- usually 3
- Comes in
- 17–21 years
The last tooth at the very back of the upper right row, behind the second molar.
- In front: #2 upper right second molar
- Behind: nothing. It's the last tooth in the row.
- Same tooth on the other side: #16 upper left wisdom tooth
- Bites against: #32 lower right wisdom tooth
None. Adult molars come in behind the baby teeth instead of replacing one.
Usually three roots (1–5) and usually three canals (1–6).
Upper wisdom teeth: roots, canals and the studies behind the counts →
This tooth is #1 in the US and 18 in the international (FDI) system, where the 1 means the upper right quarter and the 8 is its place counting from the front.
There's no international tooth 1, because those numbers always have two digits.
And in the US, #18 is the lower left second molar.
American Dental Association 2024; Harris 2005; American Dental Association 2012. Full titles are on the About page.