Mr. Wang is 40 years old, has always been very healthy teeth, regardless of cold drinks and hot dishes want to eat, want to drink, Mr. Wang is also proud of its neat and strong teeth, which is different things party drinking, he volunteered to use his teeth to open the cap of the beer bottle, even the young guy next to him also admired. However, after this party, Mr. Wang’s a tooth on the power, often chewing chewing, teeth will suddenly a burst of pain, pain out of a cold sweat, strange, only bite on the point teeth will hurt, and even slowly developed to drink a cold soda or eat a mouthful of hot rice teeth pain can not stand. Mr. Wang looked at himself in the mirror and did not see which tooth was rotten, so he came to the Department of Stomatology of the Union Hospital for consultation. After taking a medical history and conducting a thorough examination, the doctor told Mr. Wang that he had a tooth that was “cryptically cracked”. Hidden tooth fracture? What kind of disease is that? Dr. Liu Jialong of Concordia Hospital pointed out that a hidden crack is a small, non-physiological crack on the surface of a tooth that is often not easily detected. Different depths of cracks cause different degrees of pain, generally speaking, shallow cracks do not cause toothache. Deeper lines, when chewing food and encountering hot and cold acid stimuli cause severe pain. If it is already very deep, if you are not careful, you will also need to pull out the whole tooth because of the fracture caused by biting into a hard object, and the small problem will become a big trouble. This is why Mr. Wang’s teeth do not have worm teeth, but he has sore teeth because he often bites hard objects and his teeth have cracks. Why would a tooth develop a hidden crack? Because cryptoclastic teeth are mostly found in middle-aged people over 35 years old, many scholars believe that this may be related to the fact that the organic content of teeth gradually decreases with age and the inorganic content gradually increases as people enter middle age, making the teeth brittle. If one bites and chews on something that is too hard, a fine crack may occur in the tooth. These cracks are small and often go unnoticed at first. As the cracks deepen, patients begin to experience slight pain or discomfort when chewing, which gets worse. Some patients are accustomed to chewing on one side or have missing teeth on one side without timely veneers, and the other side of the tooth is subjected to too much force, which can also cause a hidden crack. Mr. Wang asked: Will a cracked tooth grow back on its own? If it does not heal by itself, how should it be treated? Dr. Liu replied that the outermost layer of tooth enamel has already stopped growing after the tooth development is completed, so the hidden tooth crack will not grow up by itself, and the early diagnosis of the hidden tooth crack is very important, the earlier the diagnosis, the better the treatment effect. Early diagnosis is very important and the earlier the diagnosis is made, the better the treatment results. Early on, even though the fissure is very fine, the doctor can detect it by staining and biting, etc. Early on, the tooth can be stopped by resharpening the steep cusp and lowering the biting surface, and immediately making a full crown restoration to encase the tooth. Alternatively, the fissure can be ground away and the tooth can be properly repaired with a filling material. If there is already significant hot or cold pain or spontaneous pain, then endodontic treatment is required before a full crown restoration is made. When the crack has involved the subgingival and apical tissues or the root has cracked, the affected tooth often has to be extracted. In this article, Mr. Wang had to remove the pulp in the hospital and do root canal treatment before making a full crown restoration because of the obvious hot and cold irritation pain in his tooth. It is a good thing that Mr. Wang’s tooth did not break in two when he bit the bottle cap, otherwise the tooth would not have been saved. After this incident, Mr. Wang also reminded his friends to cherish their teeth and seek medical attention early to maintain good chewing function and better oral health.