The term 'tooth part' refers to the various components that make up a tooth. The ROOT is the part of the tooth that is embedded in the jawbone and provides stability. DENTINE is the layer of tissue that covers the ROOT and gives the tooth its shape. The CROWN is the visible part of the tooth that is covered with ENAMEL, which is the hardest substance in the human body. Cusps are the pointed protrusions on the chewing surface of the tooth. Finally, the PULP is the innermost layer of the tooth, which contains nerves and blood vessels.