MedlinePlus: Dental Caries Definition, causes, incidence, risk factors, symptoms and treatment. http://www.nlm.nih.gov/medlineplus/ency/article/001055.htm

Tooth Decay and Cavity Prevention A collection of information, publications and news from NIDCR. http://www.nidr.nih.gov/health/newsandhealth/caries.asp

European Organisation for Caries Research ORCA promotes research into dental caries and related dieseases. http://www.orca-caries-research.org/

Health4her: Halitosis Offers possible causes and treatments. http://health4her.com/library/concerns/halitosis.cfm