People with sensitive teeth now have a Sensodyne mouthwash suitable for them. Sensodyne mouthwash is now in two flavors: Sensodyne Cool Mint and Sensodyne Extra Fresh. Both contain 3% w/w potassium nitrate which works inside the tooth to build soothing, lasting, ongoing protection around the nerve. *Use twice daily after brushing with a fluoride toothpaste for lasting sensitivity protection.