As mentioned above, the progressive development of dental caries into pulpitis and periapical inflammation can cause pain of different nature such as hot and cold irritation, spontaneous pain, discharge pain and biting pain. In addition to the pain caused by dental diseases, another type of pain in adults is “teething”. Teething? I have the impression that it is something that happens to children when they are a few years old, but why do doctors tell me that I am teething when I am 20 or 30 years old or even older? People who have experienced this will know that it is growing “wisdom teeth”, or if you have read the fairy tale king Zheng Yuanjie’s novel “wisdom teeth”, you will also know a little about it. Due to changes in living habits and food composition, the human jawbone gradually underwent degenerative changes during the evolutionary process, showing narrowing and shortening phenomena. During the evolutionary process, the changes in the teeth were not as obvious as the changes in the jawbone, which led to the jaw arch used for growing teeth, which became shorter compared to the dental arch. The shorter jaw arch naturally cannot accommodate the longer dental arch, so the last to erupt, the third molar, is naturally prevented from erupting completely. The failure of a tooth to erupt into its normal position is called incomplete eruption or simply incomplete eruption. This so-called third molar is what we call a wisdom tooth. In an incomplete eruption of the third molar, the gingival tissue around the crown of the tooth often covers the surface of the crown. A deep and narrow blind pocket is formed between the gingival flap covering the crown surface and the tooth surface. The blind pockets hold food debris and bacteria, which are difficult to remove during mouth rinsing or brushing. If the gingival flap covering the crown of the tooth is damaged (bitten or squeezed), bacteria will invade the gingival tissue through this area and cause pericoronal infection of the wisdom tooth, known as wisdom tooth pericoronitis. When systemic resistance is high, pericoronitis may be uncomfortable or only slightly localized. The systemic resistance often decreases during sleep deprivation, excessive fatigue, and women’s periods, when the inflammation and discomfort in the soft tissues around the wisdom teeth can rapidly increase, a phenomenon dentistry refers to as an “acute attack of pericoronitis. At this time, you may feel gradually increasing pain, restricted mouth opening, even half of the cheek swelling, and generalized fever. If the blood is checked, there is usually an abnormal increase in white blood cells. This is the case when the wisdom tooth is partially erupted. It is also possible that the wisdom teeth may not be completely exposed yet and make us suffer. Because of the force of eruption, it can push on the second molar in front of it, often showing abnormal pain even though there are no dental or periodontal problems. In this case, a dental radiograph may be helpful for diagnosis. So what can we do to prevent it? When the wisdom teeth have not fully erupted, pay special attention to oral hygiene. Brush your teeth after meals to maintain a clean local microenvironment for the wisdom teeth. If the wisdom teeth of the opposite jaw have fully erupted and the gum flap is bitten, the wisdom teeth of the opposite jaw should be bitten and reshaped; early pericoronitis of the wisdom teeth can be controlled and recede after less complicated treatment in the hospital dentistry department; therefore, the usual attention and early consultation with symptoms can avoid serious pain. When the acute attack of pericoronitis occurs, it is necessary to go to the hospital emergency room for local and systemic treatment in a timely manner. For those who have not erupted but squeeze the neighboring teeth painfully, tooth extraction may be the only choice.