Riva Star Disensitizer Capsule Kit - Includes 2 X 10 Single Dose Capsules (10 x Riva Star Step 1 Silver Capsules, 10 x Riva Star Step 2 Green Capsules). Silver fluoride and potassium iodide action blocks the microscopic tubules that make up dentine and provides immediate dentinal hypersensitivity relief for adults over the age of 21. **keep refrigerated. Non-invasive - – suitable for MID. 20 caps (10 x Step 1, 10 x Step 2)