Most of the ingested food can be digested in the mouth.
1.In the mouth ingested food is mixed with saliva.
2.Saliva contains an enzyme called salivary amylase, which starts digesting the starch and converts it into maltose (sugar).In mouth only starch digestion takes place.
3.Most of the ingested food can be digested in small intestine,it completes the digestion of starch, proteins and fats by the action of enzymes like amylase,trypsin and lipase.