<s>[INST] Hi I have three fully grown in wisdom teeth one I had to remove when I was nineteen but the other evening I found it very swollen around the one remaining in my bottom almost like a hard knot it has not gotten worse of better it almost seem like the the tooth is going in a little again can this happen??no pus the bump is hard like swollen gum tooth seems fine what could this be and how long should I wait till I seek help I have no insurance and dont want to unless I have to [/INST] Thanks for your query, I have gone through your query. The hard structure over the wisdom tooth could be because of the chronic irritation over the gum by the opposing wisdom tooth. The wisdom tooth can erupt til 21 years of age. Consult an oral physician and take a radiograph. Then if sufficient space is there for the tooth to erupt then get the soft tissue covering removed. If the tooth gets infected then it can produce swelling, pain, limited mouth opening. If space is not there then get the tooth removed. I hope my answer will help you. Take care. </s>