SDI Ltd. engages in the research, development, manufacturing, and marketing of dental restorative products, tooth whitening systems, and small dental equipment for sale to dental distributors, dental dealers and dentists worldwide. The firm operates through the following segments: SDI Australia; SDI Europe; SDI USA; and SDI Brazil. Its products include alloys, adhesives, sealants, cements, equipment, Riva Star tooth desensitizing agent and cavity cleanser, etchants, glass lonomers, composites, tooth whitening, and accessories. The company was founded by Jeffery James Cheetham and Pamela Joy Cheetham in 1972 and is headquartered in Melbourne, Australia.