Tooth #15 – Upper left second molar
7th tooth back from the middle, upper left.
- International
- 27
- Palmer
- 7
- Type
- Molar
- Roots
- 3
- Canals
- usually 3
- Comes in
- 12–13 years
The big back tooth between the first molar and the wisdom tooth on the upper left.
- In front: #14 upper left first molar
- Behind: #16 upper left wisdom tooth
- Same tooth on the other side: #2 upper right second molar
- Bites against: #18 lower left second molar
None. Adult molars come in behind the baby teeth instead of replacing one.
Usually three roots (1–4) and usually three canals (1–4).
Upper second molars: roots, canals and the studies behind the counts →
This tooth is #15 in the US and 27 in the international (FDI) system, where the 2 means the upper left quarter and the 7 is its place counting from the front.
In the international system, 15 is the upper right second premolar (#4).
And in the US, #27 is the lower right canine.
American Dental Association 2024; Harris 2005; American Dental Association 2012. Full titles are on the About page.