Given what we know, we can confirm that the substance which is responsible for this breakdown is Salivary amylase.
This is a very specific form of enzyme. This enzyme is found in the salivary glands of humans. Its sole function is to help break down the presence of starch in foods into simple sugars. Therefore, this is the substance responsible for that sweet sensation when chewing for extended periods of time.
Therefore, we can confirm that the substance which is responsible for this breakdown is Salivary amylase.
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