Inc. Teeth Nutrients, or food, enter the body via the mouth.
Teeth line the upper and lower jaws and are used for tearing and shredding food.
Puppies have 28 teeth, while adults have 42. The exact number can vary slightly. The teeth are living tissue and are covered with enamel, the hardest substance in the dog's or cat's body. Dentine is the next layer, and the core is called the pulp. The pulp contains blood vessels and nerves which nourish the teeth.