Dentition, dog

Dog skull with the left maxillary and mandibular permanent teeth numbered according to the modified Triadan system. The teeth visible in the left maxillary quadrant are numbered from 201 to 210. The teeth visible in the left mandibular quadrant are numbered from 303 to 311. Dogs have 42 permanent teeth (12 incisors, 4 canines, 16 premolars, and 10 molars).

Complete Triadan numbering of all quadrants of the dog's dentition is as follows: The incisors (101–103, 201–203, 301–303, 401–403) and canine teeth (104, 204, 304, 404) are single rooted. In the maxillary arch, the first premolars (105, 205) have 1 root, the second and third premolars (106, 107, 206, 207) have 2 roots, and the fourth premolars (108, 208) and first and second molars (109, 110, 209, 210) have 3 roots. In the mandibular arch, the first premolars (305, 405) have 1 root; the second, third, and fourth premolars (306–308, 406–408) and the first and second molars (309, 310, 409, 410) have 2 roots; and the third molars (311, 411) have 1 root.