Question

How can you say that digestion begins in the mouth

Answer 1

As we keep or eat the food in mouth only and not only in other organs.So we keep food in our mouth and digestion starts,

Hope you understand,
Have a nice day.

Answer 2

we say that digestion begins in the mouth because it is the medium through which the food travels .
 digestion involves breaking down of the food into simpler nutrients with the help of saliva so it is the first stage of digestion