If it has been present for 5 months, I think it is best you see a dentist. Might only be an area of scar tissue due to a sharp edge on a related tooth, but best to be on the safe side.
Want to reply to this thread or ask your own question?
You'll need to choose a username for the site, which only take a couple of moments. After that, you can post your question and our members will help you out.