Chewing gum in moderation is not harmful, but excessive gum chewing can lead to indigestion, cause temporomandibular joint disorders, and lead to poor eating habits. 1. Indigestion: While chewing gum, a lot of air may be swallowed into the abdomen, leading to increased intestinal exhaust, causing abdominal distension, abdominal pain, and even triggering irritable bowel syndrome. 2. Mandibular joint disorders: excessive chewing gum can easily lead to mandibular joint disorders, mainly manifested as pain in the joint area, chewing muscle hypertrophy and dysfunction. 3. Bad dietary habits: some people chew gum, the more they chew, the more hungry they are, the more hungry they are, even triggering an increase in appetite, leading to excessive calorie intake, which can lead to obesity and other problems. So it is recommended to chew gum in moderation, 10 to 15 minutes a day can be, not excessive chewing gum.