Possible problem: If discomfort lasts only moments, sensitivity generally does not signal a serious problem. It may be caused by; a small area of decay in a tooth, a loose filling or an exposed root surface resulting from gum recession and possibly toothbrush abrasion. What to do: If a root surface is sensitive, keep it clean and free of dental bacterial plaque. Use a soft toothbrush, cleaning very gently at the gum line, and brush no more than twice daily. Try using fluoride-containing toothpaste made for sensitive teeth. You can even try using toothpaste like an ointment, rubbing it into the root surface for ten minutes or so at a time. If the sensitivity continues, please book an appointment to see a dentist.