Final answer:
The field focused on the diagnosis, restoration, and maintenance of oral functions is dentistry, which deals with the health of the oral cavity and its contribution to overall digestion.
Step-by-step explanation:
The specialty that is concerned with the diagnosis, restoration, and maintenance of oral functions is often referred to as dentistry. Dentists and dental specialists focus on the health of the oral cavity, which includes the teeth, gums, and the associated tissues. Part of their examination often involves checking for signs of infection such as tonsillitis and testing the functions of the cranial nerves associated with the oral cavity. Moreover, they are concerned with structures specialized for digestion like salivary glands, tongue, and teeth, which play crucial roles in the digestive process starting from chewing to swallowing food.