The wisdom tooth is the third molar in the alveolar bone of the human mouth, which is the eighth tooth from the incisor in the center. It is commonly called wisdom tooth because it erupts very late, usually between the ages of 16 and 25, when the physical and psychological development of human beings is nearing maturity, and it is a symbol of the arrival of wisdom. Wisdom teeth growth, there is a great deal of individual variability, usually there should be four wisdom teeth symmetrical upper and lower left and right, some less than four, or even no, very few people will be more than four, the age of eruption also varies greatly, some people 20 years old before the eruption, some people 40, 50 years old to grow or not grow for life, these are normal phenomena. Modern medicine generally considers wisdom teeth to be the remnants of human evolution. Since wisdom teeth grow at the end of the alveolar bone, modern human alveolar bone is degraded in length, width, and strength to varying degrees due to the increasing refinement of eating, which leads to its inability to provide enough space for wisdom teeth to erupt, and diseases such as decay, periodontitis, and pulpitis of wisdom teeth or adjacent teeth can usually cause severe pain, so it is recommended that Wisdom teeth with abnormally long eruption or asymmetrical eruption should be prophylactically extracted as early as possible.