In the majority of cases, there will not be enough room in the jaw for a wisdom tooth  to fully emerge. This can lead to several complications. If the exit of the wisdom teeth is stalled at the halfway point (soft impaction), this can make brushing and flossing the wisdom teeth extremely difficult. Food and bacteria builds up between the wisdom teeth and its neighboring molars, and decay and gum infection are very likely to occur. Crowded wisdom teeth in the upper jaw have a tendency to lean sideways and cause cheek bites and ulcers. These wisdom teeth usually cause chewing problems. A further problem is wisdom teeth crowding- the pressure from wisdom teeth may also force the other teeth closer together, and interfere with the bite. Gum disease and cyst formations are also complications of impacted wisdom teeth. Very rarely, tumours may also form from the wisdom teeth. Pressure from the wisdom teeth can also cause toothache on the tooth next to it.