Tooth Sensitivity can be caused when dentine is exposed to cold, hot, sweet &amp; sour food triggers while gum problems are caused by the build-up of plaque bacteria. Fluoride in the toothpaste also helps protect against cavities. Brush twice a day for best results &amp; also use a Sensodyne toothbrush for a soft bristle, gentle brushing experience. Sensitive teeth may indicate an underlying problem that needs prompt care. If symptoms persist or worsen see your dentist. Not for use by children under 12 years of age, unless on the advice of a dental professional or doctor. Don't miss out on important life moments because of tooth sensitivity.