What are the possible reasons why someone has bad breath? Can stomach gases cause bad breath?

Totally serious here

People smoke because "it’s cool". But smoking causes bad breath and yellow teeth.

So you think that bad breath and yellow teeth are cool?

She is almost 4 years old. She has a lot of spunk and energy normally. Her beard was all slimy and wet the other day, gave her a bath and she was back to normal. Now she is doing it again but her breath stinks something fierce. I gave her a beggin strip which she usually loves and she ate it, but only a bit at a time. she usually just wolfs it right down.

I’m concerned about offending co-workers; I’ve told my boss and she’s agreed to tell me if anyone complains. I just don’t want it to happen; I’d be so embarrassed. I’ve been out of work for a long time, have no dental insurance, and am saving money up to get it fixed. But, it’s going to take time.

What should i do for bad breath?
Thick yellowish materal accumulates in my throat which causes bad-breath.It is because of that and no problem is in my mouth. Suggest away out. I visited a doctor also but?