The white powder on chewing gum is powdered sugar or sugar substitute, depending upon the type of gum, according to the William Wrigley Jr. Co. The powder is added to the gum to reduce stickiness and improve flavor.
The powder is dusted on the gum during the rolling process. After the gum ingredients are mixed, a large clump of gummy mixture is forced through rollers, which press it into thin strips. The rollers are progressively closer together, so the gum becomes thinner and thinner. After the powder is added, the gum is scored into sections. The length and shape vary depending upon the type of gum.