Conversation: The conversation between human and AI assistant.
[|Human|] I  had a root canal done last Thursday on the last upper left molar.  Within the hour, my left cheek swelled up and I had minor pain.  The swelling has gone down a bit but still sore and I noticed a small lump on left cheek...this has never happened to me (I had a previous root canal on another molar). Should I contact the endodontist that did the procedure or my dentist?  Could this be an infection?  I have no fever and only the discomfort of the root canal/cheek
[|AI|]  Hello, Thanks for posting your query. The swollen cheek followed with root canal treatment may be due to-Improper instrumentation methods used. Breakage of files inserted. Periapical infection remaining under the tooth. Infected vital pulp remaining within the pulp canals. Take complete course of antibiotics. Warm saline gargle frequently may relieve swelling. Apply cold packs alternatively. Please do visit your endodontist and get further treatments and check-ups. I wish you good health.