👉 Cacotrophia, also known as a caco-2 (or calcium carbonate) gel, is a colloidal suspension of calcium carbonate. It is used to treat conditions such as gum disease and dental caries. The substance is composed of calcium carbonate, which is a solid white or light grey powder. This substance can be found in many different types of foods and beverages, including toothpastes, mouthwashes, and even some drinks like soda.