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    Patented Phocal disks are semi-permeable fluoride in a unique disk form for insertion between the teeth. Once positioned interproximally, they soften and expand forming a gel. The disks prevent and repair early interproximal decay at the microscopic, nanoscopic and molecular levels. Phocal fluoride disks weigh 5mg, contain 1.02% fluoride ions , and come in two forms: