What does it mean if there is a small hole in the gums inside mouth after last tooth but before wisdom teeth?

If there is a small hole in the gums inside the mouth after the last tooth but before the wisdom teeth, it could be a sinus tract. A sinus tract is an abnormal channel that connects an infected area (in this case, likely an abscessed tooth root or another source of infection in the jaw) to the surface of the gums. It would be best to see a dentist or maxillofacial surgeon, as it may require treatment such as antibiotic therapy, root canal therapy, or sometimes even gum surgery to fully resolve the cause and seal the tract. The specific diagnosis and required treatment plan will depend on the underlying cause, and individual clinical assessment is therefore recommended.