Sensodyne Fresh Gel Toothpaste -150 gm Sensodyne Sensitivity & Gum is a toothpaste with two functions that helps to strengthen gums and shield sensitive teeth. It has been clinically demonstrated to lessen gum bleeding, edema, and sensitivity in the teeth. How Does Gum & Sensitivity Sensodyne Operate The special composition of Sensodyne Sensitivity & Gum combines zinc citrate and potassium nitrate. The open channels in the teeth that cause tooth sensitivity can be partially blocked by potassium nitrate. Because of its antimicrobial qualities, zinc citrate helps to lessen gum bleeding and inflammation. Sensodyne Sensitivity & Gum Advantages online today!