Tooth #17 – Lower left wisdom tooth
8th tooth back from the middle, lower left.
- International
- 38
- Palmer
- 8
- Type
- Molar
- Roots
- 2
- Canals
- usually 3
- Comes in
- 17–21 years
The last tooth at the very back of the lower left row, behind the second molar.
- In front: #18 lower left second molar
- Behind: nothing. It's the last tooth in the row.
- Same tooth on the other side: #32 lower right wisdom tooth
- Bites against: #16 upper left wisdom tooth
None. Adult molars come in behind the baby teeth instead of replacing one.
Usually two roots (1–3) and three canals.
Lower wisdom teeth: roots, canals and the studies behind the counts →
This tooth is #17 in the US and 38 in the international (FDI) system, where the 3 means the lower left quarter and the 8 is its place counting from the front.
In the international system, 17 is the upper right second molar (#2).
American Dental Association 2024; Harris 2005; American Dental Association 2012. Full titles are on the About page.