Dentists won't pull a tooth that has an abscess under it as the Injection that anaesthetises the area and makes it numb (Novocaine etc) does not work if an abscess is present, you need to go to the doctors or the in patient part of a hospital and they will gives you a weeks course of Amoxicillin (anti-biotics)to get rid of the abscess, only once the abscess has gone will a dentist pull the tooth, that's what happened to me anyway.