Hi and welcome. Lt does initially give you bad breath. Lt recommend the original listerene, (the one that looks like urine, for the want of a better description). There used to be listerene breath strips, now gone off the market and there are new ones in Ireland but don't seem to have come out in UK yet, called nuphar. People have successfully used all types on here and not affected their weight loss. Wishing you all the best.
Doirin