Also from what I have experienced and have read is that tonsilitis is a culprit for post nasal grip which leads to tonsilitis, which is a reason for bad breath. Google tonilitis and take an antihistimine like bendryl or a genric. I put something in the forum from a DR. he is a dentist and on the site he ahs treasons for bad breath, especially if they are in the mouth,stomach,or respiratory and that was ne of the things he recommended for the post nasal problems along with sinus problems. Look in the forum and you will find it. I hope this helps.