Nobody likes to hear the word "cavity." And nobody likes to feel the throbbing pain that can come with it. Unfortunately, toothaches are usually the result of a cavity or lost filling that's causing the pain. Cavities are caused by acids produced by bacteria in plaque build-up on your tooth. These acids eventually eat through your tooth's enamel surface. This in turn creates a bigger and deeper cavity. If you think you have a cavity or if you feel a pain in your mouth (dull, sharp or otherwise), visit your dentist immediately for proper diagnosis and treatment. In the meantime, for instant toothache pain relief, try pharmacist recommended Anbesol Maximum Strength in gel and liquid form.