I wouldn't recommend doing that on your own. It would be best for you to see your dentist and have them do an incision and drainage on the area. The abscess you are describing sounds very large and you should see a dentist immediately. The swelling may continue to spread and it may go to other parts of your head and face so its best to manage it ASAP before there are more complications. The antibiotics may keep the infection in check but there is definitely an underlying problem that the antibiotics cannot fix.