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This invention belongs to the field of biomaterials technology, specifically an antibacterial magnesium and strontium-reinforced bioactive glass ceramic and its applications. Its composition, by weight percentage, is as follows: SiO2: 30-50; P2O5: 5-20; CaO: 10-35; Na2O: 10-20; SrO: 5-20; MgO: 2-10; ZnO: 5-15; B2O3: 0-10; K2O: 3-10; CuO: 0.05-5; F: 1.5-5; Ag: 0.05-0.9. It possesses good biocompatibility, is non-toxic and harmless to the human body, and effectively inhibits and kills bacteria. It can be used as a special additive in oral care products such as toothpaste, mouthwash, tooth powder, tooth gel, and chewing gum, promoting tooth surface mineralization and reducing dentin hypersensitivity during the teeth cleaning process.