What is inside gum that makes it not healthy?

There is no evidence to support the idea that gum is not healthy. In fact, gum can actually be a healthy snack choice, as it is low in calories and can help to satisfy sweet cravings. However, it is important to choose sugar-free gum, as sugar-sweetened gum can contribute to tooth decay. Additionally, some people may experience allergic reactions or other adverse effects from chewing gum, so it is important to read the ingredient label carefully before consuming gum.