Final answer:
The proper way of describing a dog's first upper left permanent premolar using the Triadan system is Option 1: 106.
Step-by-step explanation:
The proper way of describing a dog's first upper left permanent premolar using the Triadan system is Option 1: 106.
In the Triadan system, each tooth in the mouth is assigned a unique number. The first upper left permanent premolar is given the number 106.: