Question

why does a piece of bread start tasting sweeter
after it is chewed

Answer 1

It is this chain of sugar molecules that we call starch. ... This is why the bread starts to taste sweet after lots of chewing - the amylase enzyme is breaking down the starch and turning it into glucose. Amylase isn't the only enzyme to break down food into molecules we can absorb.
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Answer 2

this is because when we chewed bread in mouth salivary gland secrete two things first one is saliva that moisten it and second is salivary amylase that helps in the digestion of carbohydrates so after long chewing it tastes sweet