My lip is still numb?

Recently one of my teeth had gotten infected and my mouth swelled up so I went to the E.R. The doctor there put cotton with a numbing medicine in my mouth for a while. He then stuck a needle into the swollen area and made a small incision to try to remove some puss or whatever was causing the swelling. Well it's been about a week now and my lip is still numb. It used to be the right half of my chin and lower lip but now it's just half of my lower lip. It seems the numbness dulls a bit as the swelling goes down and its still slightly swollen. Is this normal? Will the numbness be gone when the swelling is gone? Is there anything I can do to get rid of the numbness faster?