As with all other dogs, Yorkies have two sets of teeth in their life.
The first set of teeth is the 28-piece deciduous teeth (often referred to as "milk teeth", "baby teeth", or "puppy teeth").
The second set is the 42-piece permanent or adult teeth.
Sometimes the number of permanent or adult teeth may vary, which is fine as long as they do not cause bad bite.
When puppies are born, they have no teeth because milk is the only food they need.
The deciduous teeth will grow from the age of 3 to 8 weeks old, in the order of incisors, canines, and premolars.
Yorkie puppies have no molar teeth.
Yorkie puppies will start to lose their deciduous or baby teeth when the permanent or adult teeth come in.
The permanent or adult grow when the Yorkie puppies are 4 to 8 months old.
By around 8 months old, those teeth should fully develop.
The permanent or adult teeth will grow in the order of incisors, canines, premolars, and molars.
Molar teeth will develop at around 6 to 8 months old.

Yorkies and other small dog breeds may have problems if the deciduous or baby teeth do not fall out as the permanent or adult teeth grow.
This is caused by the new teeth not growing right underneath the deciduous teeth. (
Usually, a puppy's body will absorb the roots of puppy teeth.)
If the puppy tooth does not yield to the incoming tooth, it should be removed because it can cause a malocclusion or bad bite.
 Retained teeth can cause tooth decay because food can be easily caught in between the deciduous and permanent teeth.
Sometimes the new teeth are forced to grow into an abnormal position and further cause a bad bite.
The retained teeth may stay or fall weeks after the new teeth have developed.
When necessary, the retained deciduous or baby teeth need to be removed surgically.

Like other small breeds, Yorkies are also prone to severe dental disease.
Because they have a small jaw, their teeth can become crowded and may not fall out naturally.
This can cause food and plaque to build up, and bacteria can eventually develop on the surface of the teeth, leading to periodontal disease.
In addition, the bacteria can spread to other parts of the body and cause heart and kidney problems.
The best prevention is regular brushing of the teeth with a toothpaste formulated specifically for dogs.
Human toothpaste is not recommended, because it foams more easily and may be swallowed.
Professional teeth cleaning by a veterinarian may also be required to prevent the development of dental problems.
As with all other dogs, Yorkies have two sets of teeth in their life. The first set of teeth is the 28-piece deciduous teeth (often referred to as "milk teeth", "baby teeth", or "puppy teeth"). The second set is the 42-piece permanent or adult teeth. Sometimes the number of permanent or adult teeth may vary, which is fine as long as they do not cause bad bite. When puppies are born, they have no teeth because milk is the only food they need. The deciduous teeth will grow from the age of 3 to 8 weeks old, in the order of incisors, canines, and premolars. Yorkie puppies have no molar teeth. Yorkie puppies will start to lose their deciduous or baby teeth when the permanent or adult teeth come in. The permanent or adult grow when the Yorkie puppies are 4 to 8 months old. By around 8 months old, those teeth should fully develop. The permanent or adult teeth will grow in the order of incisors, canines, premolars, and molars. Molar teeth will develop at around 6 to 8 months old.
Yorkies and other small dog breeds may have problems if the deciduous or baby teeth do not fall out as the permanent or adult teeth grow. This is caused by the new teeth not growing right underneath the deciduous teeth. (Usually, a puppy's body will absorb the roots of puppy teeth.) If the puppy tooth does not yield to the incoming tooth, it should be removed because it can cause a malocclusion or bad bite.  Retained teeth can cause tooth decay because food can be easily caught in between the deciduous and permanent teeth. Sometimes the new teeth are forced to grow into an abnormal position and further cause a bad bite. The retained teeth may stay or fall weeks after the new teeth have developed. When necessary, the retained deciduous or baby teeth need to be removed surgically.
Like other small breeds, Yorkies are also prone to severe dental disease. Because they have a small jaw, their teeth can become crowded and may not fall out naturally. This can cause food and plaque to build up, and bacteria can eventually develop on the surface of the teeth, leading to periodontal disease. In addition, the bacteria can spread to other parts of the body and cause heart and kidney problems. The best prevention is regular brushing of the teeth with a toothpaste formulated specifically for dogs. Human toothpaste is not recommended, because it foams more easily and may be swallowed. Professional teeth cleaning by a veterinarian may also be required to prevent the development of dental problems.
Yorkshire Terrier