Butler Gum Expanding Floss Waxed is slim and simple to embed, grows during use to fit all interdental spaces to clean more tooth surfaces and underneath the gum line. Treat yourself to a refreshingly perfect breath with GUM Expanding Floss. This delicately waxed dental floss effectively floats through firmly set teeth and cleans those difficult to-arrive at territories. It additionally extends during use to expel plaque from more extensive holes in the teeth.