A wisdom tooth may not find naturally its proper position in the mouth, due to insufficient space. As a result, it remains impacted in the jaw. This doesn’t usually induce any problems. In some cases however, it may be tilted, putting pressure on the adjacent tooth. This can lead to headaches, teeth deconstruction or permanent periodontal problems, since the second molar loses supporting bone and might get infected.
On the other hand, a partially impacted wisdom tooth has a greater tendency to cause inflammation. Due to the lack of space while brushing, the oral hygiene is compromised, hence bacteria and food rests are being trapped in the area between the gum and the tooth, leading to infection of the gum, called pericoronitis.