The mouth contains enzymes that break down starch into simpler sugars. Specifically, saliva contains the enzyme amylase, which starts the process of starch digestion.

Here's a breakdown:

* Mouth: Amylase in saliva breaks down starch into smaller polysaccharides called dextrins.

* Small Intestine: The pancreas secretes pancreatic amylase into the small intestine, which further breaks down dextrins into maltose (a disaccharide).

* Small Intestine (again): Enzymes on the surface of the small intestine's lining break down maltose and other disaccharides into simple sugars like glucose, fructose, and galactose.

So, while the mouth is where starch digestion begins, the process continues in the small intestine until the sugars are simple enough to be absorbed by the body.