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The polymers that make up the main component of chewing gum base are hydrophobic. This property is essential because it allows for retention of physical properties throughout the mastication process. Because the polymers of gum repel water, the water-based saliva system in a consumer's mouth will dissolve the sugars and flavorings in chewing gum, but not the gum base itself. This allows for gum to be chewed for a long time without breaking down in the mouth like conventional foods. Chewing gum can be classified as a product containing a liquid phase and a crystalline phase, providing gum with its characteristic balance of plastic and elastic properties.