Tooth decay, swollen gums, and accumulation of food residue are among the most important causes of severe toothache. Gum decay and exposure of the tooth roots to food, heat and cold can also cause symptoms such as sensitivity, pain and discomfort. After the decay stage, teeth become sensitive to heat and cold. These symptoms can exacerbate inflammation in the mouth and nerve damage, which in this case requires dental nerve treatment. Before a person suffers from acute toothache, he may develop symptoms similar to sensitivity to sweets, cold and heat, and he should see a dentist after seeing these symptoms.