Thanks for the response. I was talking specifically about teeth cleaning although I might not have been clear about that. Here is what my surgeon said:
"You do not require antibiotics for the cleanings, exam as you are already outside 3 months from your last knee replacement. We only require under current protocol that you take antibiotics for cleaning within the 3 months from surgery, 2 years out for invasive dental work such as root canals, extractions, implants, cavities, extractions."