In school, we learn a lot about the parts of the tooth. Some parts we get to see every day, while others are covered and we do not discuss them on a daily basis. However, this does not mean that they are not important. The idea is to take care of your teeth and oral health in general, so that the unseen and often not discussed areas remain healthy. The dentin is one of these unseen parts of the tooth. Protected on top by the enamel and below by the root cementum, the dentin can be termed as the heart of the tooth.