Toothache is probably the most common main symptom in clinical practice, and most patients walk into the door of the hospital because they have unbearable toothache. Most of the patients’ toothache is caused by tooth decay. In superficial caries, only the enamel on the surface of the tooth is damaged and the tooth has no feeling or slight soreness. At this time, if you can detect and treat the caries in time, the treatment effect will be very ideal, and can stop the caries from developing further damage in time. Therefore, it is very necessary to have an oral examination once a year for prevention and treatment. Middle and deep caries The damage of teeth has been carried out to the dentin, and the teeth start to have sore feeling or feel sore and soft and transient pain when biting. Sensitivity to hot, cold, sweet and sour stimuli even cause transient pain. Timely consultation at this time can also try to preserve the vitality of the tooth and restore the function and appearance of the tooth as much as possible. Pulpitis When damage to the tooth penetrates through the hard tissue and reaches the nerve tissue, the pulp, the tooth usually suffers from severe spontaneous pain, sometimes radiating to the entire cheek and causing a headache. (However, there are some patients who feel essentially no pain throughout the entire procedure.) At this point, one should immediately visit a dentist, where proper root canal treatment can immediately relieve the pain and save the affected tooth. If you take delaying measures at this time, such as taking some anti-inflammatory drugs, painkillers, etc., you will miss the treatment time, which will eventually lead to the extraction of the affected tooth and its loss. This will indirectly affect the health of neighboring teeth and the whole oral cavity and chewing system. Some patients don’t feel much pain during the whole process, but the teeth have been decayed most of the time, what is the reason? This is because the development of tooth decay is very fast, the tooth pulp has not yet occurred acute inflammation, the tooth body has been decayed through to the pulp cavity, the inflammatory exudate of the tooth pulp can be drained out through the cavity, so the pain is not very intense, the general patients think that bear it will pass. But the damage to the tooth does not stop there! Bacteria will continue to destroy the periapical tissue through the pulp cavity, causing inflammation, abscess, cyst, etc. to occur in the periapical area. At this point, the pus will swell the cheek and face because it cannot be removed in time. The spread of pus and bacteria to the surrounding area will cause serious complications such as interstitial infection and osteomyelitis!