Toothache is probably the most common main symptom in clinical practice, and most patients walk through the door of the hospital because of unbearable toothache. Most of the patients’ toothache is caused by dental caries. Shallow caries only damage the enamel on the surface of the teeth, the teeth basically have no feeling or have a slight pain. At this time, if you can find and consult the doctor for treatment in time, the curative effect will be very ideal, and can prevent the continued development of caries damage in time. Therefore, an annual oral examination will be a very necessary preventive measure. Medium and deep caries tooth damage has been carried out to the dentin, the teeth began to have a sore feeling or bite objects feel sore, transient pain. Sensitive to hot and cold, sweet and sour stimuli and even cause transient pain. At this time, timely consultation can also try to save the vitality of the teeth, try to restore the function and appearance of the teeth. Pulpitis tooth damage has penetrated the hard tooth tissue and reached the blood vessels, nerve tissue – pulp, usually teeth will be spontaneous severe pain, sometimes radiating to the entire cheek and cause headaches. (However, there are some patients who basically do not feel any pain during the whole process). At this point, you should go to the dentist immediately. Proper root canal treatment can immediately relieve the pain and save the affected tooth. If you take delaying measures, such as taking anti-inflammatory drugs, painkillers, etc., you will miss the treatment time, which will ultimately lead to the extraction of the affected tooth and its loss. Indirectly affect the neighboring teeth and the entire oral cavity, chewing system health. Some patients do not feel much pain throughout the process, but the teeth have been carious for most of the reason? This is because of the rapid development of dental caries, the pulp has not yet occurred acute inflammation, the tooth has been decayed through to the pulp cavity, the pulp of the inflammatory exudate can be drained through the cavity, so the pain is not very intense, the general patient that tolerate it will be over. But the damage to the tooth doesn’t stop there! Bacteria will continue to destroy the periapical tissues through the pulp cavity, causing inflammation, abscesses, cysts, etc., to occur in the periapical area. At this point, the pus, which cannot be removed in time, causes the cheek and face to swell. The spread of pus and bacteria to the surrounding area can cause serious complications such as interstitial infections and osteomyelitis!