Amylase is mainly secreted by intestinal glands and pancreas (i.e. enteropancreatic amylase), so it mainly exists in the small intestine cavity. There is only a small amount of amylase in saliva. Rice (starch) can only be decomposed into maltose under the action of salivary amylase, but not into glucose. It is decomposed into a small amount of maltose in the small intestine cavity, and then it is decomposed into glucose again by intestinal pancreatic maltase before it can be absorbed. I hope you are satisfied.