1. Clinical reversal of root caries using ozone, double-blind, randomised, controlled 18-month trial. Gerodontology 2003; 20: 106–114.
2. Rickard GD, Richardson R, Johnson T, McColl D, Hooper L . Ozone therapy for the treatment of dental caries (Cochrane Review). In the Cochrane Library. Chichester: John Wiley, 2004, Issue 3.
3. HealOzone for the treatment of tooth decay (occlusal pit and fissure caries and root caries) National Institute for Health and Clinical Excellence, Technology Appraisal 92. July 2005. http://www.nice.org.uk/page.aspx?o=265570