The last tooth in the general dentition is called wisdom tooth, also called the end tooth in folklore, but wisdom teeth are often congenitally missing, so the last tooth may also be the second molar. Wisdom teeth in the oral cavity in the form of large variations in the number, the location is located in the upper and lower jaw oral teeth at the end of the last part of the tooth row, so the folk is also called the end of the tooth, by the development of the jawbone and the influence of their own teeth variations, wisdom teeth are often congenitally missing or morphology of abnormal eruption of the blocked situation, when the wisdom teeth congenitally missing, located in the mouth of the teeth row of the last teeth become the second molar. If the last tooth is blocked or difficult to erupt, you need to go to the hospital in time for gingivectomy or consider extracting it as soon as possible to avoid forward growth and root resorption of the front molars.