Sugars are the one of the many causes of cavities and tooth decay. On the other hand, not all sweet foods trigger dental cavities. For instance, apples and sugar-free gums are known to be teeth-friendly as they can provide health benefits to your teeth and mouth. They help improve the amount of saliva in your mouth, which is great in getting rid of bad oral bacteria. With apples and sugarless gums containing xylitol, you can also prevent bad breath odour in a simple way.