The reason for this is the following：

The main components of sugar are powdered sugar, syrup and gum base. The first two are soluble in water, and will slowly melt with saliva when chewing in the mouth, so the gum base is mainly spit out after chewing. Although the chewing gum swallowed in the stomach is difficult to be decomposed by digestive enzymes, it will be excreted casually after staying in the digestive tract for 12-72 hours, which will neither stick to the intestine nor remain in the stomach, affecting the health of children.

Extended data:

The harm of eating chewing gum

1, prefer to eat junk food.

It is reported that chewing gum before meals can eliminate hunger. However, a study published in the British Journal of Dietetic Behavior corrected this erroneous information. It is found that chewing gum not only does not affect calorie intake, but also makes fruits and vegetables bitter, reduces the intake of healthy food and increases the chances of eating junk food such as potato chips and candy.

2, love to grind your teeth when you sleep

Chewing gum all the time will cause the masticatory muscles to be in a state of tension all the time, increasing the chance of grinding teeth at night. Experts suggest that chewing gum should not exceed 15 minutes at a time.

References:

People's Network-Can children eat chewing gum? What if the child swallows gum?