title: Calcium deficiency and human periodontal disease.
mesh_terms: D000284:Administration, Oral; D002118:Calcium / Q000008:administration & dosage*; D002136:Calcium, Dietary; D003649:Decalcification, Pathologic; D005891:Gingivitis / Q000188:drug therapy; D006801:Humans; D010510:Periodontal Diseases / Q000188:drug therapy* / Q000209:etiology; D010919:Placebos
chemical_list: D002136:Calcium, Dietary; D010919:Placebos; D002118:Calcium