Is it possible for a loose tooth to tighten up on its own?

That depends: That depends on why the tooth is loose. If the tooth is recovering from a minor trauma then the answer is yes. If youhave periodontal disease and bone loss around the tooth or if the tooth has had a major trauma then the answer is no. No matter the cause loose permanent teeth should be examined by a dentist.

Depends: Depends on the cause of why it is loose. See your dentist to help determine the cause and if any treatment is needed to help you.