A wisdom tooth is the third molar present at the back of your mouth. Sometimes, they might erupt at a weird angle and cause a lot of pain. Also, due to the location of your wisdom tooth, it sometimes gets challenging to clean them, and thus, they become a site of decay and bacterial infections. This can lead to the formation of pus-filled sacs on the gums, which are painful. In all of the above cases, you should visit your dentist immediately. The only and the most effective way to get rid of this pain is through a wisdom tooth extraction.