I have a bad cavity on my lower tooth . It will most likely have to be extracted, however just a few minutes ago, I see that the area of my gum under the tooth is red and part of my lip and chin is getting numb. Is it possible I may have an abcess or an infected tooth? I have taken acetomenaphin for the pain , but it has not helped. I have a dental appt in the morning. In the meantime, what can I do to ease the pain?