Welcome~!

A relative of mine had this and he had to have a really good professional cleaning, that required two visits. It wasn't a "deep cleaning," but in his case, although he was brushing and flossing regularly, he hadn't had a professional cleaning in close to two years and there was some plaque. Additionally, he had some sinus issues and had to begin using saline spray once daily. In the end, they weren't sure if it was the extra good cleaning or the sinus spray that made the difference, but the two together cleared up the problem.You might need to visit the dentist and your GP, maybe even an ENT. Do you have any issues with dry mouth? Are you on any new medications? (some meds can cause this...as well as some medical conditions) I know this can (possibly) contribute to odors. I use sugar free lemon drops when my mouth is excessively dry.

No doubt Bryanna has heard of this before and has some words of wisdom, but this is what I observed within my family.