It actually can. Bacteria reproduce and die off rapidly. That means the rates of mutation are high. If there's no selective pressure from the antibiotics, then

It actually can. Bacteria reproduce and die off rapidly. That means the rates of mutation are high. If there's no selective pressure from the antibiotics, then there's nothing reinforcing that resistance and it can mutate away in a few generations. This has actually been tested in laboratory settings: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6707769/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6707769/