A novel dentifrice composition is provided for prevention or treatment of carcinoma of the oral cavity, caries and periodontal diseases of the oral cavity. The dentifrice composition contains a partially water-soluble calcium salt, a medicinal composition useful in the treatment of human neoplastic disease, and a hydrophilic or hydrophobic liquid vehicle. A preferred dentifrice composition is a toothpaste comprising gypsum, 3-N-phenylacetylamino-2,6-dione, gypsum, paraffin oil and a mixture of natural flavoring oils. The components of the dentifrice composition act advantageously to allow the composition to remove plaque, tartar, and oral disease-causing bacteria.