Need help solving bad breath

I’ve been talking with this girl for a few weeks now and after one of our dates she mentioned that my breath wasn’t very great. On our next date I used mouth wash and even scraped my tongue right before I saw her. I thought that would fix it but during our date she said my breath was terrible. While yes, I could just use gum or mints, the fact that my breath would be so terrible even after using mouth wash and scraping my tongue is a little concerning to me. Especially because no one else has ever mentioned my breath being bad before. Could anyone share some advice or offer some suggestions?