Tooth #19 – Lower left first molar
6th tooth back from the middle, lower left.
- International
- 36
- Palmer
- 6
- Type
- Molar
- Roots
- 2
- Canals
- usually 3
- Comes in
- 6–7 years
The first big back tooth on the lower left, right behind the premolars.
- In front: #20 lower left second premolar
- Behind: #18 lower left second molar
- Same tooth on the other side: #30 lower right first molar
- Bites against: #14 upper left first molar
None. Adult molars come in behind the baby teeth instead of replacing one.
Usually two roots (2–3) and usually three canals (2–4).
Lower first molars: roots, canals and the studies behind the counts →
This tooth is #19 in the US and 36 in the international (FDI) system, where the 3 means the lower left quarter and the 6 is its place counting from the front.
There's no international tooth 19, because those numbers always have two digits.
American Dental Association 2024; Harris 2005; American Dental Association 2012. Full titles are on the About page.