What mechanical and chemical digestion occurs in the oral cavity?

Mechanical : Mastication by the teeth.

Chemical : Enzyme Ptyalin that breaks down Carbohydrates into simpler sugars.

Explanation: Mastication in simpler terms, can be called chewing. It's the process by which the teeth reduce food into smaller pieces to increase the surface area to allow for easier digestion.

Ptyalin, a form of amylase, is a type of enzyme responsible for breaking down Carbohydrates into smaller and simpler sugars to allow for easier breakdown as the food travels through the alimentary canal.

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