Jonathan Lajoie (I) Jonathan Lajoie was born in 1980 in Montreal, QuÃ©bec, Canada. He is an actor, known for The League (2009), Let's Be Cops (2014) and Show Me Your Genitals (2008).
Universal Numbering System. Tooth number 1 is the tooth farthest back on the right side of your mouth in the upper (maxillary) jaw. Numbering continues along your upper teeth toward the front and across to the tooth farthest back on the top left side (which is number 16).
The mandibular first premolar sometimes may have three roots and three canals. 3 One study reported a C-shaped canal anatomy in this tooth. 4 The oval external outline form of the mandibular first premolar typically is wider mesiodistally than its maxillary counterpart, making it more oval and less slot-shaped.