The so-called ambulatory obstruction refers to the oral cavity teeth a kind of can not erupt, in the state of obstruction, generally common situation is the wisdom teeth of the lower jaw. Often in a state of ambulatory obstruction, but it must be noted that ambulatory and obstruction of the two words themselves are somewhat different. A blocked tooth may have partially erupted, which means that the blocked tooth is not necessarily a buried blocked tooth, and a large portion of the crown of the blocked tooth may be exposed and visible in the oral cavity. However, the term “buried primary teeth” refers to teeth that are so deeply buried in the jawbone that the corresponding teeth are not visible in the mouth and can only be seen on radiographic examination.