Does Chewing Gum Stay in Your Stomach Forever?

If you swallow your gum it will take longer to digest than a sandwich, but it won't be in your stomach forever, amassing into a giant chewed-gum-wad together with other pieces you have swallowed over time. Your stomach is a very acidic environment, with a pH of 1-3. It produces 2-3 liters of gastric fluid a day, composed mainly of hydrochloric acid and peptidase enzymes, which is more than sufficient to deal with a stick of gum.
Make Glue from Milk | Cut Apple Browning Experiment