Dentist Gave Me Amoxacilin For An Infected Tooth Under My

Dentist gave me Amoxacilin for an infected tooth under my Bridge. He opened and did something that he said would relieve the pressure and then closed it up. It's been 24 hours and the antibiotic -- not sure when it will begin to work. The Motrin is the ony thing that helps, but not much. I. Ant even wait 6hrs to take the Motrin the pain is awful. Is this common and or normal? Thank You. -Hudson-