Wisdom teeth are the third and final set of molars that emerge, usually during your late teens to early twenties. For some people the wisdom teeth emerge through the gums and have enough room to grow in naturally. For others, wisdom teeth often cause problems as they are trying to protrude through the gums. When a wisdom tooth is impacted the tooth is coming in at an angle and not straight through the gum line. This can cause pain, the tooth can come in unevenly, or the tooth may only emerge partially.