The extraction of wisdom teeth must be taken, as to what kind of film to take, there are three options, respectively, small dental film, jawbone curved body layer film and CBCT. dental film is relatively the cheapest, but the location of the display is not particularly thoughtful, may not show the depth of the lower alveolar nerve, blood vessels, and in the process of taking small dental film patients have gag reflex, and at the same time will cause soft tissue discomfort. The jawbone surface layer imaging is the recommended film, relatively medium price, at the same time can see all the tooth position, all the wisdom tooth growth, the lower alveolar nerve, blood vessels also have a better grasp, relatively cost-effective. There is also a dental CBCT, which can also be used for wisdom teeth, and it will show more clearly, but at a slightly higher price.