Riva Star Disensitizer Bottle Kit, Includes: 1 x 1.5mL Riva Star Bottle Step 1 Silver, and 1x 3.0mL Riva Star Bottle Step 2. 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. 1 x 1.5ml bottle Step 1 agent and 1 x 3.0 mL Step 2 agent