Dental sinus or root infection evaluation and treatment
A gum pimple or draining sinus near a tooth can indicate a root infection and needs examination, imaging, and treatment of the source.
The short answer
A gum pimple or draining sinus near a tooth can indicate a root infection and needs examination, imaging, and treatment of the source. The drainage may reduce pressure without eliminating infection inside the tooth.
How can bacteria spread into and through a tooth root?
Bacteria can enter the pulp through decay, a crack, or injury and spread through the root canal system. The body may form a small drainage pathway through bone and gum, appearing as a recurrent bump or bad taste.
How does a dentist identify the tooth causing a sinus tract?
A dentist tests the tooth, examines neighbouring teeth, and takes focused radiographs or other imaging when needed. Treatment may involve root canal therapy to clean and seal the canals, or extraction when the tooth cannot be predictably restored.
When does a gum swelling or sinus need prompt dental care?
Arrange prompt care for a gum swelling, sinus tract, persistent toothache, pain on biting, or a bad taste. Facial swelling, fever, eye swelling, or difficulty swallowing or breathing requires urgent assessment.
What should you ask about the infected tooth and its roots?
Ask which tooth is the source, whether it can be restored, and what imaging shows about the roots and surrounding bone. Ask how root canal treatment compares with removal and replacement in your situation.
Frequently asked questions
Can a dental sinus disappear on its own?
Drainage can stop temporarily, but the tooth may still contain infection and needs assessment.
Are antibiotics enough?
They may be used in selected spreading or systemic infections, but they do not remove infected tissue inside a tooth.
Who wrote this page
This library is published by Dental Nation, a licensed dental group practising in the United Arab Emirates. Pages are written and overseen by the same clinical team that treats patients in our clinics, and are held to a fixed editorial standard for safety and accuracy.
This page is patient education, not medical advice, and cannot replace an examination. Anything urgent — facial swelling, trauma, uncontrolled bleeding or severe pain — needs a dentist or emergency care now.