A Pumice Powder is added to dental cleaning products where a gentle yet effective abrasive is required. Pumice is a product that originates from volcanic activity so is totally natural. Pumice is formed when lava containing high levels of gases and water erupts from a volcano. Pumice is recommended as a cleaning and polishing aid to finish acrylic denture moulds. It is used in a slurry form to assist dental technicians obtain a smooth surface. Pumice Powder is very effective.