MEDLINEplus health informationCompiled by the U.S. National Library of Medicine, extensive coverage of consumer health topics which include dental health, child dental health, cleft lip and palate, dentures, gum disease, head and neck cancer, mouth disorders, oral cancer, orthodontia, salivary gland disorders, tooth disorders, etc. It has also a medical encyclopaedia, a medical dictionary, information on prescription and non-prescription drugs.