How does a tooth ache immediately stop pain?

The so-called tooth decay is actually caused by acid under the action of the formation of holes. If there is pain, that has been fast corrosion to the nerve, when the nerve pain occurs, will show hot and cold stimulation pain or swelling, can not be treated in time, you can take painkillers; if there is inflammation, you can take anti-inflammatory drugs. Later still need to see a doctor, clean up the caries, remove the infected pulp, for thorough treatment, simple medication, after relief will also return pain.