I had an infection in my mouth a few years back. At first I just thought that I had a cut on my gums, but after a few days the cut became inflamed and then I started to get a very weird taste in my mouth.
I finally decided to see a doctor and they prescribed a course of oral antibiotics as treatment. I had to take the drugs for about two weeks, but the infection started clearing up in a mater of days. Luckily there have been no lasting effects.