The part of the tooth that is visible above the gum is called the **crown**. Below are some key details about the crown of the tooth.

The Crown of the Tooth
- The crown is the portion of the tooth that is exposed in the mouth and is primarily responsible for the function of chewing and grinding food.
- It is covered by a hard, protective layer called **enamel**, which is the hardest substance in the human body.

Structure of the Crown
- **Enamel**: This outer layer protects the tooth from decay and damage. It is translucent and varies in color from white to shades of yellow or gray.
- **Dentin**: Beneath the enamel lies the dentin, a softer tissue that makes up the bulk of the tooth. Dentin contains microscopic tubules that transmit sensations of temperature and pressure to the nerve endings in the tooth.
- **Pulp**: The innermost part of the crown is the pulp chamber, which contains blood vessels and nerves. This vital tissue provides nourishment to the tooth and responds to sensations.

Function of the Crown
- The crown plays a crucial role in **mastication** (chewing), allowing for the effective breakdown of food.
- It also contributes to the aesthetic appearance of the smile, as it is visible when a person talks or smiles.

Conclusion
Understanding the anatomy and function of the crown is essential for maintaining dental health. Regular dental check-ups and good oral hygiene are vital for preserving the integrity of the crown and overall tooth structure.