G.A.
My ex when we met had bad breath too. He always chewed on mints but in a couple years after we were married the breath was bad even when his mouth was closed. I just happen to be getting my teeth cleaned and told the dentist so when he had his teeth cleaned they found he had a bad gum disease. He had to have his gum craped and then after that has deep cleaning when they are done. So it can be contagious. G. W