Hello. I'm Dr. Christensen.
I'm sorry you're having trouble with your tooth. You didn't mention if your abscess
is in one of your upper teeth, in which case the swelling in the roof of your mouth could be a collection of pus and should, therefore, be lanced. If your abscess is in one of your lower teeth, the swelling in the roof of your mouth could be a sign of an allergic reaction
to the antibiotic, and this should be evaluated immediately by your doctor.
Now, keep in mind that even after this swelling is addressed, the antibiotic you're taking is only a temporary fix. Once the antibiotic is completed, your abscess will probably return unless you see a dentist
to get your bad tooth addressed.
I hope that answers your question, and I hope things go well for you.