Worlds no.1 selling toothpaste for sensitive teeth. Indications What Causes Sensitive Teeth 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 contains the channels to the nerves which cause the pain. How Does Sensodyne Work Clinically proven sensodyne fresh mint with fluoride builds a protective barrier against the pain of sensitive teeth by blocking the channels to the nerves which transmit the pain. Dosage To build and maintain the protective barrier use sensodyne every time you brush. In place of your normal toothpaste sensodyne fresh mint will protect your teeth from cavities while keeping them sparkling clean. Its minty flavour leaves your mouth feeling clean and refreshed. If sensitivity persists see your dentist.