The oral cavity is the space inside the mouth that plays a crucial role in digestion and communication. It includes the lips, cheeks, gums, teeth, tongue, and the roof and floor of the mouth. The oral cavity is responsible for the initial stages of digestion, where food is mechanically broken down by the teeth and mixed with saliva produced by the salivary glands. Additionally, the oral cavity is essential for speech and articulation. The tongue and lips help form sounds and words, allowing for effective communication. Maintaining good oral hygiene is important to prevent issues such as cavities and gum disease, which can affect overall health.