It sounds like your Dentist is being very careful with you. As of this date the only reported negative events with extraction and healing have been with people who have had bisphosphonates for a time in their IV lines ; mostly after chemotherapy.
Since you mentioned you have some mobility of your teeth...the Dentist needs to know if that is due to the gums and ligaments of the teeth (periodontal disease) or systemic bone disease (osteonecrosis of the jaws).
Good luck to you and keep taking the antibiotics until they are finished !
Best wishes,
Rachel