I have suffered with this problem previously for years, tried all available over the counter chemist remedies with negative results and expensive exercise, did not try the tablets as did not wish to risk the side effects.
Read somewhere that a small trial using vicks vaporub showed promising results, tried it and it worked no more nail infection. Also bathed feet every couple of days with a few drops of bleach, additional to daily showers and Bingo.
Had tried the feet bathing previously as above whilst using chemist products no improvement, this is a slow progress as toenails grow quite slow but you should see improvement in 2 to 3 weeks and basically no cost.
Good Health Everyone