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Teeth (sometimes called dentes) are accessory organs of the human digestive system. They are located in the buccal cavity, which is also known as the oral cavity and as the mouth. There are normally four types of teeth in an adult human mouth. Teeth are the organs of chewing, which is also known as mastication. Teeth cut, tear and grind food in the mouth, enabling it to be mixed with saliva (from the salivary glands) effectively and therefore swallowed more easily. The actions performed by the teeth are all mechanical-as opposed to chemical.
Each tooth is an organ consisting of three layers: the pulp, dentin, and enamel. 1  The pulp of the tooth is a vascular region of soft connective tissues in the middle of the tooth. 2  Tiny blood vessels and nerve fibers enter the pulp through small holes in the tip of the roots to support the hard outer structures.