Sensodyne Original is a specially formulated toothpaste for sensitive teeth. It contains strontium chloride and is proven to relieve the pain of sensitive teeth when used twice a day. It Is The Original Formula Of The Sensodyne Range Of Sensitive Teeth Toothpastes. Please Note That This Product Does Not Contain Fluoride. Builds increasing protection against painful sensitivity of the teeth due to cold, heat, acids, sweets, or contact. Aids in the prevention of dental cavities. Use Sensodyne whenever you normally brush: It contains Potassium Nitrate clinically proven to reduce painful sensitivity. It provides fast relief within two weeks. It has fluoride for cavity protection. Its great taste keeps mouth feeling fresh and clean. This product contains no sugar. If pain/sensitivity still persists after 4 weeks of use, please visit your dentist. Stop use and ask a dentist if the problem persists or worsens. Sensitive teeth may indicate a serious problem that may need prompt care by a dentist. Keep out of reach of children. If more than used for brushing is accidentally swallowed, get medical help or contact a Poison Control Center right away.