Wisdom teeth that grow completely upright are usually easier to remove than obstructed wisdom teeth, or wisdom teeth that are completely buried. If only part of the tooth grows out and the other part does not, and the tooth appears to be blocked, these blocked wisdom teeth can be difficult to remove. In addition, the difficulty of extraction is usually related to the length of the root, the number of roots, the degree of curvature of the root, and the degree of bone density of the alveolar bone. If the roots are too long, too curved, too many roots, or even if the roots are close to the mandibular nerve canal, then it is difficult to extract them. If the wisdom tooth is partially obstructed and only part of the crown grows out, this wisdom tooth also needs to be extracted by splitting the crown and cutting the root first, which will also cause relatively large trauma to the soft and hard tissues.