Wisdom teeth are the third and final set of molars that erupt in the back corners of the upper and lower normal adult mouth. Unfortunately, most people experience problems from wisdom teeth; in most cases, this is because the teeth erupt too close to existing permanent teeth, causing crowding, improper bites, and other problems. If wisdom teeth are causing a problem and are not pulled, they can sometimes become impacted. Impacted wisdom teeth can be extremely painful, as well as harmful to your oral health. Symptoms are easy to spot: pain, inflammation, and some kinds of infections. Many people need to have their wisdom teeth extracted to avoid future serious problems. In general, the lack of the four wisdom teeth does not hamper one's ability to properly bite down, speak or eat.