There is no scientific answer to which chewing gum holds its flavor the longest. However, mint and cinnamon gums last much longer than fruit-flavored gums, due to their strong flavor and aroma, according to education.com.
The enzymes in saliva begin to erode the flavor in chewing gum almost immediately, but the preservatives added during the manufacturing process act to slow the loss of flavor. Some chewing gum manufacturers claim their products can hold flavor for several hours. Cadbury's Stride and Wrigley's 5 brands are popular for flavor retention. The question of which chewing gum lasts the longest is a common project in school science fairs.