mouth
Throughout the entire digestive system, including the mouth(saliva).
Physically is is chewed (so this is a purely physical breakdown). CHemically it reacts with the amylase in saliva and is broken down further.
Food is chewed and moistened in the mouth, where it mixes with saliva to begin the process of breaking down carbohydrates. The teeth help mechanically break down food into smaller pieces, while enzymes in the saliva start to chemically digest starches.
Saliva
Mucin softens the food to allow it to slide down the oesophagous more easily
When enzymes in saliva mix with starch, first the carbohydrates are broken down into dextrin. Then dextrin is broken down into maltose and glucose
The saliva in the mouth adds an enzyme to the food being chewed to help break it down before it gets swallowed. Saliva also adds moisture to the food to help make it easier to swallow.
the saliva breaks down the bread into sugars
Food enters mouth, as it is chewed, enzymes in the saliva begins to break it down. It is swallowed
Saliva and some enzymes in the small intestine.
Yes, saliva contains an enzyme called amylase, which helps break down starches into simpler sugars. This process begins in the mouth during chewing and continues as food moves through the digestive system.
Human saliva is not a good cleaner, because saliva is mainly meant for the digestive system. Saliva was meant to break down starches while the food is being chewed, so saliva does not make a good cleaner. Saliva was not meant to clean.