Sensitivity, a common problem experienced by adults of all ages, is a short sharp pain often activated by heat, cold, acids, sweets or brushing. It is usually caused when gums recede and expose the dentine, which has the channels to the nerves that cause the pain. Sensodyne works in two ways to keep sensitive teeth pain free and gums healthy. • Builds a barrier against the pain of sensitivity. • Helps reduce plaque and kill the germs that cause early gum disease. Gum disease may lead to receding gums - a common cause of sensitive teeth.