Teeth that are healthy are living. You might not consider your teeth to be alive. When the nerves in the pulp of the tooth, which is the inner layer, are injured or decayed, they might cease supplying blood to the tooth. This can result in an infection and the nerve dying. The dentist will classify your teeth's health based on these issues. If you have any questions about your dental health, or if you would like to make an appointment with Dr. Seibel, please don't hesitate to contact us today! We look forward to seeing you in our office soon. The answer is yes, teeth are part of the body. However, only certain parts of the body are visible - except for teeth. Under the surface, teeth are made up of bone, muscle, saliva, nerves, and blood vessels. They also contain a special type of tissue called dentin that makes up 90% of the tooth's mass. Dentin is similar to bone in its makeup but has a softer quality than bone so it tends to be more flexible. Teeth come in two main types: primary and permanent. Your baby teeth usually fall out around the age of 12-14 years old. These missing teeth were once adult teeth that grew in during puberty.