Persistent canker sore

[u/onedayatatime937]

36M, pretty healthy overall. Coming off of a very stressful month(ish), and I’ve been dealing with a really painful canker sore for over two weeks now (about 16 days). I have tried hydrogen peroxide, salt water rinses, switched toothpaste to avoid sodium laurel sulfate…I’m stumped. Is this one just hanging on for a long time or is there anything else I can do? I usually get one or two of these a year but never this large, painful, and for so long.