Wisdom tooth is the Third Molar teeth which erupt in the oral cavity. These teeth usually erupt at 18-25 years. In some persons they do not erupt at all and in some persons it erupt partially which causes pain and inflammation of the gums around the tooth. This condition is known as Pericoronitis
. You should Take Warm saline gargle 4-5 times a day for relief. An X- Ray will only determine the position of the tooth. If the tooth is impacted it should be surgically removed for a permanent relief.