I have bad breath. It seems like it is coming from my throat , uvula or tonsils or surrounding area. My mouth hygiene is more than excellent, no bad decay, no tarter, I visit the dentist every 6 month, I do mouth washes, coconut oil pulling regularly, all kind of expensive mouth wash, hydrogen peroxide...etc. but the problem is not in my mouth it's in my throat, I also don't have frequent infections or tonsil stones. Is there surgical treatment for this condition