I’ve dated two guys who frequently had bad breath, but two different kinds. One of them had that sort of plaque / never flossed a day in his life / rotten tooth breath, and the other had hunger / poo breath as though he hadn’t eaten or drank any water all day.
I remember being in the car with Captain Poo Breath once and I actually had to open the window, it was turning my stomach. He asked me why I’d opened it as it was a cold day and I had the car heating on, which would have been the perfect opportunity to tell him his mouth smelled like a boiled egg on top of a fresh turd, but I couldn’t bring myself to.