Here's why:

* Epithelial tissue is a type of tissue that covers surfaces of your body, both inside and out.

* The lining of your mouth is made up of squamous epithelium, which is a thin, flat layer of cells.

* This type of epithelium is great for protecting the delicate tissues of your mouth from abrasion while you eat and talk.

* It also helps to prevent the entry of bacteria and other harmful substances.

Other examples of epithelial tissue include:

* Skin: The outer layer of your skin is composed of epithelial tissue.

* Lining of the digestive tract: This helps to protect your digestive system from the harsh chemicals and enzymes involved in digestion.

* Lining of the lungs: This allows for gas exchange between the air and your blood.

* Lining of blood vessels: This helps to regulate the flow of blood.

Let me know if you'd like to learn more about different types of epithelial tissue!