With rare exceptions, puppies are born without teeth. The first teeth to erupt are the incisors, at 2
to 3 weeks of age. Next are the canines and premolars. The last premolar erupts
at about 8 to 12 weeks of age. As a rule, the teeth of larger breeds erupt
sooner than those of smaller breeds.
The average puppy has 28 deciduous (temporary or baby) teeth. These are the
incisors, canines, and premolars. Puppies don’t have molars.
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The deciduous teeth remain for only three to seven months. Beginning at
about 3 months of age, the baby incisors are shed and replaced by adult
incisors. By 5 months, a puppy should have all her adult incisors. The adult
canines, premolars, and molars come in between 4 and 7 months of age. Thus, by
7 to 8 months of age, a puppy should have all her adult teeth. Knowing this
teething sequence can give you an approximate idea of the age of a puppy.
The average adult dog has 42 teeth: 22 in the
mandible or lower jaw, and 20 in the maxilla or upper jaw. In each jaw there
are 6 incisors, 2 canines, and 8 premolars. There are 6 molars in the lower jaw
and 4 in the upper jaw.
In adult dogs, approximate age can be determined by
checking the wear on the incisors. This method is relatively reliable up to
about 6 years of age, but individual variations do occur. Beyond 7 years, using
the teeth to determine age is unreliable.
Retained Baby Teeth
Normally, the roots of the baby teeth are reabsorbed as the adult teeth take
their place. When this fails to happen, you will see what appears to be a
double set of teeth. Toy breeds, in particular, tend to retain baby teeth as
their adult teeth erupt. The adult teeth are then pushed out of line, producing
a malocclusion or bad bite.
Treatment: Puppies 3 to 4 months of age should be checked from time to time
to see that their adult teeth are coming in normally. Whenever baby teeth
interfere with adult teeth, the baby teeth should be pulled. If this is done by
4 to 5 months of age, the bite should correct spontaneously.
Cavities are not common in dogs. When present, they usually form at the gum
line and are related to periodontal disease. They can
also occur on the crown of a molar. They appear as a black spot on the tooth.
Cavities are painful and eventually lead to root abscesses.
Treatment:The quickest and easiest way to treat a cavity is to extract the
tooth. The cavity can be filled and the tooth saved, but most veterinarians do
not have the supplies and the equipment to fill cavities and will refer the dog
to a veterinarian who specializes in dentistry.
Root canal therapy is also being done for dogs who have deep cavities that
expose the tooth pulp. Root canals are fairly common today and can be
especially useful for dogs with fractured canine teeth.