Digestive system

[bbygx]

where does digestion begin?

[fo3nix]

In your mouth: enzymes and chewing.

[heathfield]

To expand on Fo3nix's answer, the enzymes are in the saliva. See here.

[peanut273]

Starts in the mouth when you chew, Saliva glands produce amylase (converting starch to maltose)