The best thing you can do after you've had a tooth out is rinse with hot salty water - about 1/4-1/2 teaspoon of salt in a cup of water as hot as you can stand it. This is the best thing to kill any infection and stop any new infection forming. Rinse 3 or 4 times a day and after you eat anything. If the pain doesn't get any better or gets worse you might have a dry socket and you will need to go to your dentist again to have it dressed