Sunstar Americas, Inc., maker of the GUM brand of oral care products, is expanding its GUM Crayola and Power Rangers lines of kids with new flavors. The Crayola line will now include Tropical Twist-flavored toothpaste while the Power Rangers range will feature a new red, berry-flavored toothpaste. Sunstar is also expanding the the Power Ranger stable with themed colored flossers.   The new GUM Crayola toothpaste in the fruit punch flavor comes in flip-top cap with a smaller opening to ensure l...