I have tonsils removed, don't have post nasal drip, and have excellent dental hygiene with 3 yearly trips to dentist for deep cleaning etc.
Perhaps my Dad's side passed it on to me, and two my siblings. I passed it on to two of kids (sh!t truly runs in the family). And I have tried every single thing posted not only on this site but anywhere else I have heard and/watched to no permanent fix.
I have also tried homeopathic, allopathic, Gastroenterologists, upper endoscopies, lower endoscopies, H-pilori tests, SIBO tests, 100 of different kinds of probiotics, kombucha treatment, Chinese medicine, herbal medicine, Indian Hakeem, Russian Babushka hacks, African bush and black magic treatments, acupuncture, acupressure, every single availane kind of mouth wash, hydrogen peroxide, backing soda, I mean, you name it, and I might have tried it. My quest took me all around the world, risked my life in the African wild bush, and have tried many, many remedies - but here I am, 100% confident that I will take it to my grave with me.
So long story short, I occasionally take Lansoprazole (Prevacid) for heartburn. In the past, I have taken esomeprazole, Pantoprazole, Omeprazole) and they all work pretty good to take care of my occasional heartburn, but Lansoprazole usually works pretty good for me.
I was recently visiting Los Angeles, and had a trigger on the heartburn. Stopped at a local Target to pick a travel pack of Lansoprazole, but they were out so I picked esomeprazole since it's the same ppi family. Popped a pill in my mouth on empty stomach and it took care of it but I decided to keep taking it every morning till I run out of 14 pills and complete the course. (I have done that in past as well).
On a side, I occasionally watch Dr. Pradip Jamnadas on Youtube.
And I was watching one of his videos where he suggested to use PRE-biotic fiber with Inulin for a good gut health and microbiome and all that junk. Most of his videos are sh!tty and I don't give a flying flock about it.
But I searched one of these prebiotic with inulin on Amazon and based on reviews, ordered one just for the heck of it. This is when I was still in Los Angeles.
I arrived back home after 5 days (had taken 5 pills of esomeprazole every morning by now) and the Pre-biotic/inulin was delivered.
Started taking it every morning half an hour after have taken esomeprazole on empty stomach.
So, get up in the morning, rinse my mouth, take esomeprazole with a full 16 oz Spring water bottle, waited 30 minutes and then took the pre-biotic with inulin mixed in a cup of plain water.
First 8 to 9 days were quite bad after starting this sh!t.
Lots of gas, discomfort in the stomach, and bulge moving in the intestines.
I always brush my teeth before going to bed. This includes thoroughly scrapping the tongue all the way to the dorsum, and then brushing for a good 3 to 4 minutes. (and indeed the breath stinks like Sh!t in the morning when I wake up).
While I was going thru this discomfort period, I would wake up in the middle of the night and took a sample of saliva from the dorsum, and as always it smelt like sh!t or rotten bone, dead animal etc.
I gave up on any hope but kept taking the esomeprazole and this sh!t - and at about day 10, the discomfort in the stomach had significantly reduced and I noticed that all of a sudden my saliva had no odor and taste in my mouth (that's usually bitter and bad), was pretty neutral.
I was like, WTF?
For testing purposes, I didn't brush my teeth for two days straight, and kept checking my saliva and the taste in my mouth, and to my surprise, it remained in a good state. I ate regular food that included meat, eggs, bread, sugar, dairy veggies, coffee tea etc (I NEVER drink alcohol and NEVER smoke).
I have now completed the 14 day course of esomeprazole and have been taking the pre-biotic inulin - and I feel that the taste in my mouth and saliva's odor has significantly improved. It's almost neutral. I have started back on brushing my teeth, twice a day and things look not too bad.
I have a confidence of 99.99% that my halitosis will come back with vengeance but for now, it is in the improved state for the last many days. Lets see how long it stays that way?
For those of you who know me, I am here on this website long enough to promote any sh!t. So here is the disclaimer for formality. I am NOT promoting any sh!t here. I am just throwing it out there as a story of my personal experience that may not work for anyone else. Sh!t is not very pricey, so I suggested it to one of my siblings who is going to start taking it.
We do NOT know whether it's the pre-biotic with inulin alone or it's with the combination of esomeprazole? I guess we will know it in a few days now that I ran out of esomeprazole.
Here are the products that I used. Should be all under $30.00

@Jimi
If you wanna give it a shot, send me your address in the PM and I will send both to you.