Guess what guys? Sugar is bad for you. Aspartame is also bad for you. Spry Gum is sweetened with xylitol—a natural sweetener. Xylitol doesn’t allow bacteria to stick to teeth. This unique quality means the bacteria can’t colonize in the mouth. Because they can’t thrive, they also can’t produce their bi-product, acid, which is the culprit to tooth decay and cavities.