Can dental infection become resistant to Clindamycin?

[Carpediem511]

Because I have an artificial joint I take 600mg of Clindamycin Prior to dental work. I han root canal done on a tooth under a permanent bridge a year ago by a General Dentist. One hour start to finish. It was infected, but I was never given any additional antibiotics. Since that time had an ongoing foul taste and odor when I used Water Flosser daily. The adjacent tooth became infected and also required a root canal. This time done by an Endadontist. Two hour procedure, packed with antibiotics and two weeks later root canal completed.
Within a week the taste and odor returned once again.
Some dentist say I have an infection then Endodontist says there is no infection.
I recently had surgery done on my leg with the artificial joint. An incision became infected. My doctors and I are very cautious about overusing antibiotics. But the risk of the infection contaminating the joint was to high and I was put in Clindamycin for 10 days.
During this time I noticed that the taste and odor from the area around questionable infected tooth went away. It returned around a week after I finished the Clindamycin.
This shows me that I defiantly have a dental infection. My concern is, because the infection returned is this infection resistant to Clindamycin. If so, how can I get to the bottom of this with conflicting opinions ?
I certainly fear loosing more teeth but my major concern is my artificial joint. It would be a nightmare if that should become contaminated by any future dental procedures.