Three months ago, I had a broken tooth repaired. The dentist packed my tooth with a white material. I'm not sure if he did a root canal (family friend, did it for free. Now I am having a dull deep pain that won't go away. The dentist gave me penicillin four days ago but the pain still won't go away. Does it take time for antibiotics to get rid of pain? Note: I have 40 500mg pills and have to take four a day.