I want to ask about halitosis. I already went to the dentist and the dentist said that the problem is not in the mouth and it could be in my stomach so here I am. I hope you can help me because I am at my wit's end right now. How do I know if it is in the stomach? What should I do? I do not think it is acid reflux because I already take PPIs for more than one month and it seems to be still there. Please help me.