How Does This Antibiotic Situation Work? I Need Help Please.?

I need help figuring out a situation and antibiotics may be the problem. In Dec I was given Amox for a tooth infection. It returned after my RC (done by a specialist), so the DDS put me on Amox again. In Jan another DDS put me on Pen. I was ok until Feb and my DDS said maybe still have infection so let's put you back on Amox. DDS put me on Amox again that time. That means I have taken Amox 3 times and Pen 1 time. I am now feeling symptoms again 1 mth later. If infection is due to a tooth problem, it's so small that xrays don't even show it. Here's what I am wondering. If I took Amox and it got rid of the infection, but then it returned, does that mean it works? Because I'm now wondering if perhaps I am resistant to the antibiotic and that's why it keeps returning.... so maybe I need a stronger antibiotic before I redo the root canal. In other words, can it clear with something stronger, and is it possibly resistant even though it works while I'm on the Amox?

How Does This Antibiotic Situation Work? I Need Help Please.?
The important issue is to determine if you have a bacterial infection, viral infection, fungal infection, or no infection. Antibiotics only treat bacterial infections, the usual signs/symptoms associated with bacterial infections include: fever, swelling, pain, heat or warmth at the site and the formation of pus. In chronic infections the signs/symptoms may be less evident. I would ask your DDS or an MD to order a blood test known s a 'CBC with differential" as there are certain types of White Blood Cells that elevate with bacterial infections. CBC: Complete Blood Count, Differential: identifies individual types of white blood cells. Another test would be a 'Culture and Sensitivity' where a swab is used at the location of the symptoms to determine what organism is the culprit and what antibiotic will affect a cure. Amoxicillin and Penicillin are classic antibiotics that usually work well in oral infections caused by the usual bacteria culprits, however, there are many organisms resistant to these drugs and subsequently are ineffective. Main thing is to determine if your symptoms are due to an infection, and what sort of infection it is...hope this helped some.
Reply:What are your tooth pain symproms? If you have discomfort from the tooth that the root canal was done, see the specialist and let him reevalusae his work. If the tooth had a chronic infection before root canal therapy, a simple root canal may not have gotten out all the infection. You may need to further eradicate bacteria that is present beyond the nerve canal with a surgical procedure called an apicoectomy.