We went for a checkup, the doctor says that his throat is red and slig…

We went for a checkup, the doctor says that his throat is red and slightly sore. There's no fever, runny nose or cough. The child is active. I asked if the teeth could affect the throat, or how it can be red in the throat without a fever? The doctor didn't answer... the fever was 38 degrees, it lasted 3 days now it's been 5 days, everything is normal except for the throat.