Tooth pain is usually caused by decay, infection, or gum problems, so please see a dentist to find the underlying cause. Treatment depends on the problem and may include a filling, root canal treatment, gum treatment, or, in some cases, removal of the tooth if it is badly damaged. Until you are examined, you may take paracetamol for pain relief, rinse your mouth with warm salt water, and avoid very hot, cold, or sweet foods.