When I had my wisdom teeth removed, I did the salt water rinse for a while, and it seemed like they would never heal. I found a mouthwash at Whole Foods, made by J/A/S/O/N cosmetics that had calendula and some other botanicals in it. It said it would speed healing and cut down on swelling/irritation. It worked like a charm, and now I return to it whenever I have dental work done that involves my gums; they get irritated by just about everything. It may just take a while for your tooth to heal. I don't think there'd be an infection if it's not swollen, hot, painful, or oozing anything.