Count the number of teeth of each type in the upper (U) and lower (L) jaw. Each row in the chart shows the number of each type of teeth in the Upper (U) and Lower (L) jaw, and on the right and left side. The numbers are of the form "5-5" (for example). This means that there are 5 teeth on the left side, and 5 teeth on the right side.

For example, the Opossum has 5 incisors on the left upper jaw, 5 incisors on the right upper jaw, 4 incisors on the left lower jaw, and 4 incisors on the right lower jaw.

If you can't tell the different types of teeth apart, start by getting the total number of teeth in both upper and lower jaws. Then use the "Total" column as a starting point. From there you may be able to narrow it down by the size of the skull (a raccoon skull will be smaller than a bear skull, for example), or by other characteristics.

The chart is arranged in order by the total number of teeth, from the most down to the least number.

Incisors are the teeth closest to the front of the skull, Molars are the farthest to the rear.

Sometimes there are multiple species listed in the Latin Names and Common Names columns. This means that all of the species listed have that particular dental formula.

Sometimes a species will have a varying number of teeth. This is indicated, for example, as follows:
Rangifer (32/34) (which means that they will have either 32 or 34 teeth in total),
or Dasypus (28-32) which means that they will have between 28 and 32 teeth in total.

	Incisors	Canines	Premolars	Molars	Total U Total L	Total	Latin Names	Common Names
U L	5-5 4-4	1-1 1-1	3-3 3-3	4-4 4-4	26 24	50	Didelphis	Opossum
U L	3-3 3-3	1-1 1-1	4-4 4-4	3-3 3-3	22 22	44	Condylura Parascalops Scapanus Sus	Starnose Mole Hairytail Mole Townsend, Pacific, California Mole Wild Boar
U L	3-3 3-3	1-1 1-1	4-4 4-4	2-2 3-3	20 22	42	Alopex Canis Thalarctos Urocyon Ursus Vulpes	Arctic Fox Coyote, Grey Wolf, Red Wolf Polar Bear Grey Fox Black, Grizzly, Big Brown Bear Red, Swift, Kit Fox
U L	3-3 3-3	1-1 1-1	4-4 4-4	2-2 2-2	20 20	40	Bassariscus Nasua Procyon	Ringtail Coati Racoon
U L	2-2 3-3	1-1 1-1	3-3 3-3	3-3 3-3	18 20	38	Myotis Pecari	Myotis group of Bats Peccary
U L	3-3 3-3	1-1 1-1	4-4 4-4	1-1 2-2	18 20	38	Gulo Martes	Wolverine Marten, Fisher
U L	3-3 2-2	1-1 0-0	3-3 3-3	3-3 3-3	20 16	36	Scalopus	Eastern Mole
U L	2-2 1-1	1-1 1-1	3-3 4-4	3-3 3-3	18 18	36	Neurotrichus	Shrew-Mole
U L	2-2 3-3	1-1 1-1	2-2 3-3	3-3 3-3	16 20	36	Lasionycteris Plecotus	Silver-haired Bat W. & E. Big-eared Bat
U L	3-3 3-3	1-1 1-1	4-4 3-3	1-1 2-2	18 18	36	Lutra	River Otter
U L	2-2 2-2	1-1 1-1	2-2 3-3	3-3 3-3	16 18	34	Macrotus Mormoops	Leafnose Bat Leafchin Bat
U L	2-2 3-3	1-1 1-1	2-2 2-2	3-3 3-3	16 18	34	Euderma Pipistrellus	Spotted Bat W. & E. Pipistrel
U L	3-3 3-3	1-1 1-1	3-3 3-3	1-1 2-2	16 18	34	Mephitis Mustela Spilogale Taxidea	Striped Skunk Shorttail, Least, Longtail Weasels Black-footed Ferret, Mink Spotted Skunk Badger
U L	0-0 3-3	1-1 1-1	3-3 3-3	3-3 3-3	14 20	34	Cervus Rangifer (32/34)	Elk Woodland, Barren Ground Caribou
U L	3-3 1-1	1-1 1-1	3-3 1-1	3-3 3-3	20 12	32	Blarina Microsorex Sorex	Shorttail Shrew Pigmy Shrew Various Shrews
U L	2-2 3-3	1-1 1-1	1-1 2-2	3-3 3-3	14 18	32	Eptesicus	Big Brown Bat
U L	1-1 3-3	1-1 1-1	2-2 2-2	3-3 3-3	14 18	32	Lasiurus borealis Lasiurus cinereus Lasiurus seminolus Tadarida brasiliensis	Red Bat Hoary Bat Seminole Bat Mexican Freetail Bat
U L	3-3 2-2	1-1 1-1	3-3 3-3	1-1 2-2	16 16	32	Enhydra	Sea Otter
U L	3-3 3-3	1-1 1-1	2-2 3-3	1-1 2-2	14 18	32	Conepatus	Hognose Skunk
U L	0-0 3-3	0-0 1-1	3-3 3-3	3-3 3-3	12 20	32	Alces Antilocapra Bison Odocoileus Oreamnos Ovibos Ovis Rangifer (32/34)	Moose Pronghorn Bison Mule, Whitetail Deer Mountain Goat Muskox Bighorn, White Sheep Woodland, Barren Ground Caribou
U L	0-0 0-0	0-0 0-0	8-8 8-8		16 16	32	Dasypus (28-32)	Armadillo (28-32 teeth)
U L	3-3 1-1	1-1 1-1	2-2 1-1	3-3 3-3	18 12	30	Cryptotis	Least Shrew
U L	2-2 0-0	1-1 1-1	2-2 3-3	3-3 3-3	16 14	30	Choeronycteris	Hognose Bat
U L	2-2 2-2	1-1 1-1	2-2 3-3	2-2 2-2	14 16	30	Leptonycteris	Longnose Bat
U L	1-1 3-3	1-1 1-1	1-1 2-2	3-3 3-3	12 18	30	Lasiurus ega Lasiurus intermedius Nycticeius	Western Yellow Bat Eastern Yellow Bat Evening Bat
U L	1-1 2-2	1-1 1-1	2-2 2-2	3-3 3-3	14 16	30	Eumops Tadarida femorosacca Tadarida molossa	Mastiff Bats Pocketed Freetail Bat Big Freetail Bat
U L	3-3 3-3	1-1 1-1	3-3 2-2	1-1 1-1	16 14	30	Felis	Jaguar, Mountain Lion, Ocelot
U L	3-3 1-1	1-1 1-1	1-1 1-1	3-3 3-3	16 12	28	Notiosorex	Grey Shrew
U L	1-1 2-2	1-1 1-1	1-1 2-2	3-3 3-3	12 16	28	Antrozous	Pallid Bat
U L	3-3 3-3	1-1 1-1	2-2 2-2	1-1 1-1	14 14	28	Lynx	Lynx Bobcat
U L	2-2 1-1	0-0 0-0	3-3 2-2	3-3 3-3	16 12	28	Lepus Sylvilagus	Hares & Jackrabbits Rabbits
U L	0-0 0-0	0-0 0-0	7-7 7-7		14 14	28	Dasypus (28-32)	Armadillo (28-32 teeth)
U L	2-2 1-1	0-0 0-0	3-3 2-2	2-2 3-3	14 12	26	Ochotona	Pikas
U L	1-1 1-1	0-0 0-0	2-2 1-1	3-3 3-3	12 10	22	Ammospermophilus Aplodontia Citellus Cynomys Eutamias Glaucomys Marmota Sciurus aberti Sciurus carolinensis Sciurus griseus Tamiasciurus	Antelope Squirrels Mountain Beaver Rock, Ground, Golden-mantled Squirrels Prairie Dogs Chipmunks except Eastern Flying Squirrels Woodchuck, Marmots Tassel-Eared Squirrel Eastern Grey Squirrel Western Grey Squirrel Red Squirrel (usually 20 teeth)
U L	1-1 1-1	0-0 0-0	1-1 1-1	3-3 3-3	10 10	20	Castor Cratogeomys Dipodomys Erethizon Geomys Liomys Microdipodops Myocastor Perognathus Sciurus apache Sciurus arizonensis Sciurus niger Tamias Tamiasciurus Thomomys	Beaver Mexican Pocket Gopher Kangaroo Rats Porcupine Pocket Gophers (except Mexican) Mexican Pocket Mouse Dark, Pale Kangaroo Mouse Nutria Pocket Mice (except Mexican) Apache Fox Squirrel Arizona Grey Squirrel Eastern Fox Squirrel Eastern Chipmunk Red Squirrel (also 22), Chickaree Pocket Gophers
U L	1-1 1-1	0-0 0-0	1-1 0-0	3-3 3-3	10 8	18	Zapus	Jumping Mice (except Woodland)
U L	1-1 1-1	0-0 0-0	0-0 0-0	3-3 3-3	8 8	16	Baiomys Clethrionomys Dicrostonyx Lagurus Lemmus Microtus Mus Napaeozapus Neofiber Neotama Ondatra Onychomys Oryzomys Peromyscus Phenacomys Pitymys Rattus Reithrodontomys Sigmodon Synaptomys	Pygmy Mouse Redback Voles Collared Lemmings Sagebrush Vole Brown Lemming Voles (except Pine & Sagebrush) House Mouse Woodland Jumping Mouse Florida Water Rat Woodrats Muskrat Grasshopper Mice Rice Rat Mice: Cactus, Merriam, California, Canyon, Deer, Sitka, Oldfield, White-footed, Cotton, Brush, White-ankled, Pinon, Rock, Florida, Golden Phenacomys Pine Vole Norway, Black Rats Harvest Mice Cotton Rats Bog Lemmings

For more information, see DeLoy Roberts Skull Collection

Tracks & Sign: Mammals, Birds, Other Animals Skulls

Dental Formulae of Mammal Skulls of North America

Dental Formulae of Mammal Skulls
of North America